10-K Filing

EVERSOURCE ENERGY CIK: 72741 FY 2020

Filing Information

Form Type	10-K
Accession Number	`0000072741-21-000005`
Period End Date	20201231
Filing Date	20210217
Fiscal Year	2020
Fiscal Period	FY
XBRL Instance	es-20201231_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 84 Income Statement 63 Cash Flow Statement 121 Stockholders Equity 41 Comprehensive Income 21

Balance Sheet 84 line items

Line Item	Tag	Value	Unit	Period
Allowance for uncollectible accounts	`AllowanceForDoubtfulAccountsReceivable`	$358.85M	USD	Point-in-time
Allowance for uncollectible accounts	`AllowanceForDoubtfulAccountsReceivable`	$224.82M	USD	Point-in-time
Cash	`Cash`	$15.43M	USD	Point-in-time
Cash	`Cash`	$106.60M	USD	Point-in-time
Receivables, Net (net of allowance for uncollectible accounts of $358,851 and $224,821 as of December 31, 2020 and 2019, respectively)	`AccountsReceivableNetCurrent`	$989.38M	USD	Point-in-time
Receivables, Net (net of allowance for uncollectible accounts of $358,851 and $224,821 as of December 31, 2020 and 2019, respectively)	`AccountsReceivableNetCurrent`	$1.20B	USD	Point-in-time
Unbilled Revenues	`ReceivablesFromCustomers`	$181.01M	USD	Point-in-time
Unbilled Revenues	`ReceivablesFromCustomers`	$233.03M	USD	Point-in-time
Fuel, Materials, Supplies and REC Inventory	`InventoryRawMaterialsAndSupplies`	$235.47M	USD	Point-in-time
Fuel, Materials, Supplies and REC Inventory	`InventoryRawMaterialsAndSupplies`	$265.60M	USD	Point-in-time
Regulatory Assets	`RegulatoryAssetsCurrent`	$651.11M	USD	Point-in-time
Regulatory Assets	`RegulatoryAssetsCurrent`	$1.08B	USD	Point-in-time
Prepayments and Other Current Assets	`OtherAssetsCurrent`	$342.13M	USD	Point-in-time
Prepayments and Other Current Assets	`OtherAssetsCurrent`	$252.44M	USD	Point-in-time
Total Current Assets	`AssetsCurrent`	$2.41B	USD	Point-in-time
Total Current Assets	`AssetsCurrent`	$3.13B	USD	Point-in-time
Property, Plant and Equipment, Net	`PublicUtilitiesPropertyPlantAndEquipmentNet`	$27.59B	USD	Point-in-time
Property, Plant and Equipment, Net	`PublicUtilitiesPropertyPlantAndEquipmentNet`	$30.88B	USD	Point-in-time
Regulatory Assets	`RegulatoryAssetsNoncurrent`	$4.86B	USD	Point-in-time
Regulatory Assets	`RegulatoryAssetsNoncurrent`	$5.49B	USD	Point-in-time
Goodwill	`Goodwill`	$4.45B	USD	Point-in-time
Goodwill	`Goodwill`	$4.43B	USD	Point-in-time
Investments in Unconsolidated Affiliates	`EquityMethodInvestments`	$871.63M	USD	Point-in-time
Investments in Unconsolidated Affiliates	`EquityMethodInvestments`	$1.11B	USD	Point-in-time
Marketable Securities	`MarketableSecuritiesNoncurrent`	$449.13M	USD	Point-in-time
Marketable Securities	`MarketableSecuritiesNoncurrent`	$456.62M	USD	Point-in-time
Other Long-Term Assets	`OtherAssetsNoncurrent`	$512.24M	USD	Point-in-time
Other Long-Term Assets	`OtherAssetsNoncurrent`	$583.85M	USD	Point-in-time
Total Deferred Debits and Other Assets	`AssetsNoncurrentOtherThanNoncurrentInvestmentsAndPropertyPlantAndEquipment`	$11.12B	USD	Point-in-time
Total Deferred Debits and Other Assets	`AssetsNoncurrentOtherThanNoncurrentInvestmentsAndPropertyPlantAndEquipment`	$12.09B	USD	Point-in-time
Total Assets	`Assets`	$46.10B	USD	Point-in-time
Total Assets	`Assets`	$41.12B	USD	Point-in-time
Notes Payable	`NotesPayable`	$889.08M	USD	Point-in-time
Notes Payable	`NotesPayable`	$1.25B	USD	Point-in-time
Long-Term Debt Current Portion	`LongTermDebtCurrent`	$327.41M	USD	Point-in-time
Long-Term Debt Current Portion	`LongTermDebtCurrent`	$1.05B	USD	Point-in-time
Rate Reduction Bonds Current Portion	`RateReductionBondsCurrent`	$43.21M	USD	Point-in-time
Rate Reduction Bonds Current Portion	`RateReductionBondsCurrent`	$43.21M	USD	Point-in-time
Accounts Payable	`AccountsPayableCurrent`	$1.37B	USD	Point-in-time
Accounts Payable	`AccountsPayableCurrent`	$1.15B	USD	Point-in-time
Regulatory Liabilities	`RegulatoryLiabilityCurrent`	$361.15M	USD	Point-in-time
Regulatory Liabilities	`RegulatoryLiabilityCurrent`	$389.43M	USD	Point-in-time
Other Current Liabilities	`OtherLiabilitiesCurrent`	$836.83M	USD	Point-in-time
Other Current Liabilities	`OtherLiabilitiesCurrent`	$809.21M	USD	Point-in-time
Total Current Liabilities	`LiabilitiesCurrent`	$4.92B	USD	Point-in-time
Total Current Liabilities	`LiabilitiesCurrent`	$3.61B	USD	Point-in-time
Accumulated Deferred Income Taxes	`DeferredIncomeTaxLiabilitiesNet`	$3.76B	USD	Point-in-time
Accumulated Deferred Income Taxes	`DeferredIncomeTaxLiabilitiesNet`	$4.10B	USD	Point-in-time
Regulatory Liabilities	`RegulatoryLiabilityNoncurrent`	$3.66B	USD	Point-in-time
Regulatory Liabilities	`RegulatoryLiabilityNoncurrent`	$3.85B	USD	Point-in-time
Derivative Liabilities	`DerivativeLiabilitiesNoncurrent`	$338.71M	USD	Point-in-time
Derivative Liabilities	`DerivativeLiabilitiesNoncurrent`	$294.54M	USD	Point-in-time
Asset Retirement Obligations	`AssetRetirementObligationsNoncurrent`	$499.71M	USD	Point-in-time
Asset Retirement Obligations	`AssetRetirementObligationsNoncurrent`	$488.51M	USD	Point-in-time
Accrued Pension, SERP and PBOP	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$1.37B	USD	Point-in-time
Accrued Pension, SERP and PBOP	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$1.65B	USD	Point-in-time
Other Long-Term Liabilities	`OtherLiabilitiesNoncurrent`	$948.51M	USD	Point-in-time
Other Long-Term Liabilities	`OtherLiabilitiesNoncurrent`	$810.55M	USD	Point-in-time
Total Deferred Credits and Other Liabilities	`LiabilitiesOtherThanLongtermDebtNoncurrent`	$10.42B	USD	Point-in-time
Total Deferred Credits and Other Liabilities	`LiabilitiesOtherThanLongtermDebtNoncurrent`	$11.34B	USD	Point-in-time
Long-Term Debt	`LongTermDebtNoncurrent`	$13.77B	USD	Point-in-time
Long-Term Debt	`LongTermDebtNoncurrent`	$15.13B	USD	Point-in-time
Rate Reduction Bonds	`RateReductionBonds`	$496.91M	USD	Point-in-time
Rate Reduction Bonds	`RateReductionBonds`	$540.12M	USD	Point-in-time
Noncontrolling Interest - Preferred Stock of Subsidiaries	`RedeemableNoncontrollingInterestEquityPreferredCarryingAmount`	$155.57M	USD	Point-in-time
Noncontrolling Interest - Preferred Stock of Subsidiaries	`RedeemableNoncontrollingInterestEquityPreferredCarryingAmount`	$155.57M	USD	Point-in-time
Common Shares	`CommonStockValue`	$1.73B	USD	Point-in-time
Common Shares	`CommonStockValue`	$1.79B	USD	Point-in-time
Capital Surplus, Paid In	`AdditionalPaidInCapital`	$7.09B	USD	Point-in-time
Capital Surplus, Paid In	`AdditionalPaidInCapital`	$8.02B	USD	Point-in-time
Retained Earnings	`RetainedEarningsAccumulatedDeficit`	$4.18B	USD	Point-in-time
Retained Earnings	`RetainedEarningsAccumulatedDeficit`	$4.61B	USD	Point-in-time
Accumulated Other Comprehensive Income	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-76.41M	USD	Point-in-time
Accumulated Other Comprehensive Income	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-65.06M	USD	Point-in-time
Treasury Stock	`TreasuryStockValue`	$299.06M	USD	Point-in-time
Treasury Stock	`TreasuryStockValue`	$277.98M	USD	Point-in-time
Common Shareholders' Equity	`StockholdersEquity`	$12.63B	USD	Point-in-time
Common Shareholders' Equity	`StockholdersEquity`	$14.06B	USD	Point-in-time
Common Shareholders' Equity	`StockholdersEquity`	$11.49B	USD	Point-in-time
Common Shareholders' Equity	`StockholdersEquity`	$11.09B	USD	Point-in-time
Commitments and Contingencies (Note 13)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Commitments and Contingencies (Note 13)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Total Liabilities and Capitalization	`LiabilitiesAndStockholdersEquity`	$41.12B	USD	Point-in-time
Total Liabilities and Capitalization	`LiabilitiesAndStockholdersEquity`	$46.10B	USD	Point-in-time

Income Statement 63 line items

Line Item	Tag	Value	Unit	Period
Operating Revenues	`Revenues`	$8.90B	USD	Annual
Operating Revenues	`Revenues`	$8.45B	USD	Annual
Operating Revenues	`Revenues`	$8.53B	USD	Annual
Purchased Power and Transmission	`UtilitiesOperatingExpensePurchasedPowerPurchasedTransmissionAndFuelUsed`	$3.14B	USD	Annual
Purchased Power and Transmission	`UtilitiesOperatingExpensePurchasedPowerPurchasedTransmissionAndFuelUsed`	$2.99B	USD	Annual
Purchased Power and Transmission	`UtilitiesOperatingExpensePurchasedPowerPurchasedTransmissionAndFuelUsed`	$3.04B	USD	Annual
Operations and Maintenance	`UtilitiesOperatingExpenseMaintenanceAndOperations`	$1.36B	USD	Annual
Operations and Maintenance	`UtilitiesOperatingExpenseMaintenanceAndOperations`	$1.34B	USD	Annual
Operations and Maintenance	`UtilitiesOperatingExpenseMaintenanceAndOperations`	$1.48B	USD	Annual
Depreciation	`Depreciation`	$819.93M	USD	Annual
Depreciation	`Depreciation`	$981.38M	USD	Annual
Depreciation	`Depreciation`	$885.28M	USD	Annual
Amortization of Regulatory Assets, Net	`AmortizationofRegulatoryAssetLiability`	$177.68M	USD	Annual
Amortization of Regulatory Assets, Net	`AmortizationofRegulatoryAssetLiability`	$252.03M	USD	Annual
Amortization of Regulatory Assets, Net	`AmortizationofRegulatoryAssetLiability`	$195.38M	USD	Annual
Energy Efficiency Programs	`EnergyEfficiencyPrograms`	$501.37M	USD	Annual
Energy Efficiency Programs	`EnergyEfficiencyPrograms`	$472.38M	USD	Annual
Energy Efficiency Programs	`EnergyEfficiencyPrograms`	$535.76M	USD	Annual
Taxes Other Than Income Taxes	`TaxesExcludingIncomeAndExciseTaxes`	$729.75M	USD	Annual
Taxes Other Than Income Taxes	`TaxesExcludingIncomeAndExciseTaxes`	$711.03M	USD	Annual
Taxes Other Than Income Taxes	`TaxesExcludingIncomeAndExciseTaxes`	$752.78M	USD	Annual
Impairment of Northern Pass Transmission	`TangibleAssetImpairmentCharges`	-	USD	Annual
Impairment of Northern Pass Transmission	`TangibleAssetImpairmentCharges`	-	USD	Annual
Impairment of Northern Pass Transmission	`TangibleAssetImpairmentCharges`	$239.64M	USD	Annual
Total Operating Expenses	`OperatingExpenses`	$6.94B	USD	Annual
Total Operating Expenses	`OperatingExpenses`	$6.75B	USD	Annual
Total Operating Expenses	`OperatingExpenses`	$6.92B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$1.70B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$1.99B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$1.59B	USD	Annual
Interest Expense	`InterestExpense`	$498.81M	USD	Annual
Interest Expense	`InterestExpense`	$533.20M	USD	Annual
Interest Expense	`InterestExpense`	$538.45M	USD	Annual
Other Income, Net	`NonoperatingIncomeExpense`	$132.78M	USD	Annual
Other Income, Net	`NonoperatingIncomeExpense`	$128.37M	USD	Annual
Other Income, Net	`NonoperatingIncomeExpense`	$108.59M	USD	Annual
Income Before Income Tax Expense	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic`	$1.56B	USD	Annual
Income Before Income Tax Expense	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic`	$1.19B	USD	Annual
Income Before Income Tax Expense	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic`	$1.33B	USD	Annual
Income Tax Expense	`IncomeTaxExpenseBenefit`	$346.19M	USD	Annual
Income Tax Expense	`IncomeTaxExpenseBenefit`	$273.50M	USD	Annual
Income Tax Expense	`IncomeTaxExpenseBenefit`	$288.97M	USD	Annual
Net Income	`NetIncomeLoss`	$916.57M	USD	Annual
Net Income	`NetIncomeLoss`	$1.04B	USD	Annual
Net Income	`NetIncomeLoss`	$1.21B	USD	Annual
Net Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$7.52M	USD	Annual
Net Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$7.52M	USD	Annual
Net Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$7.52M	USD	Annual
Net Income Attributable to Common Shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$1.21B	USD	Annual
Net Income Attributable to Common Shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$909.05M	USD	Annual
Net Income Attributable to Common Shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$1.03B	USD	Annual
Basic Earnings Per Common Share (in dollars per share)	`EarningsPerShareBasic`	$3.25	USD	Annual
Basic Earnings Per Common Share (in dollars per share)	`EarningsPerShareBasic`	$3.56	USD	Annual
Basic Earnings Per Common Share (in dollars per share)	`EarningsPerShareBasic`	$2.83	USD	Annual
Diluted Earnings Per Common Share (in dollars per share)	`EarningsPerShareDiluted`	$3.25	USD	Annual
Diluted Earnings Per Common Share (in dollars per share)	`EarningsPerShareDiluted`	$3.55	USD	Annual
Diluted Earnings Per Common Share (in dollars per share)	`EarningsPerShareDiluted`	$2.81	USD	Annual
Basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	338.84M	shares	Annual
Basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	317.37M	shares	Annual
Basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	321.42M	shares	Annual
Diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	339.85M	shares	Annual
Diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	322.94M	shares	Annual
Diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	317.99M	shares	Annual

Cash Flow Statement 121 line items

Line Item	Tag	Value	Unit	Period
Net Income	`NetIncomeLoss`	$916.57M	USD	Annual
Net Income	`NetIncomeLoss`	$1.04B	USD	Annual
Net Income	`NetIncomeLoss`	$1.21B	USD	Annual
Depreciation	`Depreciation`	$819.93M	USD	Annual
Depreciation	`Depreciation`	$981.38M	USD	Annual
Depreciation	`Depreciation`	$885.28M	USD	Annual
Deferred Income Taxes	`DeferredIncomeTaxExpenseBenefit`	$209.81M	USD	Annual
Deferred Income Taxes	`DeferredIncomeTaxExpenseBenefit`	$257.15M	USD	Annual
Deferred Income Taxes	`DeferredIncomeTaxExpenseBenefit`	$174.81M	USD	Annual
Uncollectible Expense	`ProvisionForDoubtfulAccounts`	$53.46M	USD	Annual
Uncollectible Expense	`ProvisionForDoubtfulAccounts`	$61.34M	USD	Annual
Uncollectible Expense	`ProvisionForDoubtfulAccounts`	$63.45M	USD	Annual
Pension, SERP and PBOP Expense, Net	`PensionAndOtherPostretirementBenefitExpense`	$22.00M	USD	Annual
Pension, SERP and PBOP Expense, Net	`PensionAndOtherPostretirementBenefitExpense`	$12.89M	USD	Annual
Pension, SERP and PBOP Expense, Net	`PensionAndOtherPostretirementBenefitExpense`	$5.50M	USD	Annual
Pension and PBOP Contributions	`PensionAndOtherPostretirementBenefitContributions`	$111.52M	USD	Annual
Pension and PBOP Contributions	`PensionAndOtherPostretirementBenefitContributions`	$194.95M	USD	Annual
Pension and PBOP Contributions	`PensionAndOtherPostretirementBenefitContributions`	$121.78M	USD	Annual
Regulatory (Under)/Over Recoveries, Net	`IncreaseDecreaseInRegulatoryAssetsAndLiabilities`	$124.87M	USD	Annual
Regulatory (Under)/Over Recoveries, Net	`IncreaseDecreaseInRegulatoryAssetsAndLiabilities`	$516.41M	USD	Annual
Regulatory (Under)/Over Recoveries, Net	`IncreaseDecreaseInRegulatoryAssetsAndLiabilities`	$-34.92M	USD	Annual
Amortization	`AmortizationOfDeferredCharges`	$177.68M	USD	Annual
Amortization	`AmortizationOfDeferredCharges`	$195.38M	USD	Annual
Amortization	`AmortizationOfDeferredCharges`	$252.03M	USD	Annual
Payments Related to CYAPC's DOE Pre-1983 Spent Nuclear Fuel Obligation	`ProceedsFromPaymentsForItemsRelatedToSpentNuclearFuel`	$-29.00M	USD	Annual
Payments Related to CYAPC's DOE Pre-1983 Spent Nuclear Fuel Obligation	`ProceedsFromPaymentsForItemsRelatedToSpentNuclearFuel`	$29.00M	USD	Point-in-time
Payments Related to CYAPC's DOE Pre-1983 Spent Nuclear Fuel Obligation	`ProceedsFromPaymentsForItemsRelatedToSpentNuclearFuel`	-	USD	Annual
Payments Related to CYAPC's DOE Pre-1983 Spent Nuclear Fuel Obligation	`ProceedsFromPaymentsForItemsRelatedToSpentNuclearFuel`	$-145.00M	USD	Annual
Proceeds from DOE Spent Nuclear Fuel Litigation	`ProceedsFromLegalSettlements`	$68.84M	USD	Annual
Proceeds from DOE Spent Nuclear Fuel Litigation	`ProceedsFromLegalSettlements`	-	USD	Annual
Proceeds from DOE Spent Nuclear Fuel Litigation	`ProceedsFromLegalSettlements`	-	USD	Annual
Impairment of Northern Pass Transmission	`TangibleAssetImpairmentCharges`	-	USD	Annual
Impairment of Northern Pass Transmission	`TangibleAssetImpairmentCharges`	-	USD	Annual
Impairment of Northern Pass Transmission	`TangibleAssetImpairmentCharges`	$239.64M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$196.09M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$111.22M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$174.29M	USD	Annual
Accounts Receivables from Subsidiaries	`IncreaseDecreaseInAccountsAndOtherReceivables`	$141.43M	USD	Annual
Accounts Receivables from Subsidiaries	`IncreaseDecreaseInAccountsAndOtherReceivables`	$98.72M	USD	Annual
Accounts Receivables from Subsidiaries	`IncreaseDecreaseInAccountsAndOtherReceivables`	$351.84M	USD	Annual
Fuel, Materials, Supplies and REC Inventory	`IncreaseDecreaseInInventories`	$15.40M	USD	Annual
Fuel, Materials, Supplies and REC Inventory	`IncreaseDecreaseInInventories`	$8.07M	USD	Annual
Fuel, Materials, Supplies and REC Inventory	`IncreaseDecreaseInInventories`	$831.00K	USD	Annual
Taxes Receivable/Accrued, Net	`IncreaseDecreaseInIncomeTaxesReceivable`	$67.77M	USD	Annual
Taxes Receivable/Accrued, Net	`IncreaseDecreaseInIncomeTaxesReceivable`	$16.13M	USD	Annual
Taxes Receivable/Accrued, Net	`IncreaseDecreaseInIncomeTaxesReceivable`	$-43.82M	USD	Annual
Accounts Payable	`IncreaseDecreaseInAccountsPayable`	$14.87M	USD	Annual
Accounts Payable	`IncreaseDecreaseInAccountsPayable`	$24.48M	USD	Annual
Accounts Payable	`IncreaseDecreaseInAccountsPayable`	$122.57M	USD	Annual
Other Current Assets and Liabilities, Net	`IncreaseDecreaseInOtherOperatingCapitalNet`	$11.60M	USD	Annual
Other Current Assets and Liabilities, Net	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-78.23M	USD	Annual
Other Current Assets and Liabilities, Net	`IncreaseDecreaseInOtherOperatingCapitalNet`	$9.59M	USD	Annual
Net Cash Flows Provided by Operating Activities	`NetCashProvidedByUsedInOperatingActivities`	$1.83B	USD	Annual
Net Cash Flows Provided by Operating Activities	`NetCashProvidedByUsedInOperatingActivities`	$1.68B	USD	Annual
Net Cash Flows Provided by Operating Activities	`NetCashProvidedByUsedInOperatingActivities`	$2.01B	USD	Annual
Investments in Property, Plant and Equipment	`PaymentsToAcquirePropertyPlantAndEquipment`	$2.94B	USD	Annual
Investments in Property, Plant and Equipment	`PaymentsToAcquirePropertyPlantAndEquipment`	$2.91B	USD	Annual
Investments in Property, Plant and Equipment	`PaymentsToAcquirePropertyPlantAndEquipment`	$2.57B	USD	Annual
Proceeds from Sales of Marketable Securities	`ProceedsFromSaleAndMaturityOfMarketableSecurities`	$434.12M	USD	Annual
Proceeds from Sales of Marketable Securities	`ProceedsFromSaleAndMaturityOfMarketableSecurities`	$566.59M	USD	Annual
Proceeds from Sales of Marketable Securities	`ProceedsFromSaleAndMaturityOfMarketableSecurities`	$900.75M	USD	Annual
Proceeds from Sales of Marketable Securities Used to Pay Pre-1983 Spent Nuclear Fuel Obligation	`ProceedsfromSaleandMaturityofMarketableSecuritiesUsedforPaymentofFuel`	-	USD	Annual
Proceeds from Sales of Marketable Securities Used to Pay Pre-1983 Spent Nuclear Fuel Obligation	`ProceedsfromSaleandMaturityofMarketableSecuritiesUsedforPaymentofFuel`	-	USD	Annual
Proceeds from Sales of Marketable Securities Used to Pay Pre-1983 Spent Nuclear Fuel Obligation	`ProceedsfromSaleandMaturityofMarketableSecuritiesUsedforPaymentofFuel`	$145.00M	USD	Annual
Purchases of Marketable Securities	`PaymentsToAcquireMarketableSecurities`	$537.26M	USD	Annual
Purchases of Marketable Securities	`PaymentsToAcquireMarketableSecurities`	$908.39M	USD	Annual
Purchases of Marketable Securities	`PaymentsToAcquireMarketableSecurities`	$401.82M	USD	Annual
Acquisition of Assets of Columbia Gas of Massachusetts, Net of Restricted Cash	`PaymentsToAcquireBusinessesGross`	$1.11B	USD	Annual
Acquisition of Assets of Columbia Gas of Massachusetts, Net of Restricted Cash	`PaymentsToAcquireBusinessesGross`	-	USD	Annual
Acquisition of Assets of Columbia Gas of Massachusetts, Net of Restricted Cash	`PaymentsToAcquireBusinessesGross`	-	USD	Annual
Investments in Unconsolidated Affiliates, Net	`PaymentsToAcquireEquityMethodInvestments`	$239.67M	USD	Annual
Investments in Unconsolidated Affiliates, Net	`PaymentsToAcquireEquityMethodInvestments`	$205.15M	USD	Annual
Investments in Unconsolidated Affiliates, Net	`PaymentsToAcquireEquityMethodInvestments`	$416.34M	USD	Annual
Other Investing Activities	`PaymentsForProceedsFromOtherInvestingActivities`	$-6.75M	USD	Annual
Other Investing Activities	`PaymentsForProceedsFromOtherInvestingActivities`	$-24.20M	USD	Annual
Other Investing Activities	`PaymentsForProceedsFromOtherInvestingActivities`	$-23.81M	USD	Annual
Net Cash Flows Used in Investing Activities	`NetCashProvidedByUsedInInvestingActivities`	$-2.44B	USD	Annual
Net Cash Flows Used in Investing Activities	`NetCashProvidedByUsedInInvestingActivities`	$-3.27B	USD	Annual
Net Cash Flows Used in Investing Activities	`NetCashProvidedByUsedInInvestingActivities`	$-4.13B	USD	Annual
Issuance of Common Shares, Net of Issuance Costs	`ProceedsFromIssuanceOfCommonStock`	-	USD	Annual
Issuance of Common Shares, Net of Issuance Costs	`ProceedsFromIssuanceOfCommonStock`	$928.99M	USD	Annual
Issuance of Common Shares, Net of Issuance Costs	`ProceedsFromIssuanceOfCommonStock`	$852.30M	USD	2 Qtrs
Issuance of Common Shares, Net of Issuance Costs	`ProceedsFromIssuanceOfCommonStock`	$929.00M	USD	1 Quarter
Issuance of Common Shares, Net of Issuance Costs	`ProceedsFromIssuanceOfCommonStock`	$314.10M	USD	Point-in-time
Issuance of Common Shares, Net of Issuance Costs	`ProceedsFromIssuanceOfCommonStock`	$509.20M	USD	Point-in-time
Issuance of Common Shares, Net of Issuance Costs	`ProceedsFromIssuanceOfCommonStock`	$852.25M	USD	Annual
Cash Dividends on Common Shares	`PaymentsOfDividendsCommonStock`	$663.24M	USD	Annual
Cash Dividends on Common Shares	`PaymentsOfDividendsCommonStock`	$640.11M	USD	Annual
Cash Dividends on Common Shares	`PaymentsOfDividendsCommonStock`	$744.66M	USD	Annual
Cash Dividends on Preferred Stock	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	$7.52M	USD	Annual
Cash Dividends on Preferred Stock	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	$7.52M	USD	Annual
Cash Dividends on Preferred Stock	`PaymentsOfDividendsPreferredStockAndPreferenceStock`	$7.52M	USD	Annual
Increase in Notes Payable	`ProceedsFromShortTermDebt`	$325.37M	USD	Annual
Increase in Notes Payable	`ProceedsFromShortTermDebt`	$13.96M	USD	Annual
Decrease in Notes Payable	`RepaymentsOfShortTermDebt`	$379.31M	USD	Annual
(Repayments)/Issuance of Rate Reduction Bonds	`ProceedsPaymentsOfIssuanceOfRateReductionBonds`	$635.66M	USD	Annual
(Repayments)/Issuance of Rate Reduction Bonds	`ProceedsPaymentsOfIssuanceOfRateReductionBonds`	$-43.21M	USD	Annual
(Repayments)/Issuance of Rate Reduction Bonds	`ProceedsPaymentsOfIssuanceOfRateReductionBonds`	$-52.33M	USD	Annual
Issuance of Long-Term Debt	`ProceedsFromIssuanceOfLongTermDebt`	$1.52B	USD	Annual
Issuance of Long-Term Debt	`ProceedsFromIssuanceOfLongTermDebt`	$2.76B	USD	Annual
Issuance of Long-Term Debt	`ProceedsFromIssuanceOfLongTermDebt`	$2.20B	USD	Annual
Retirement of Long-Term Debt	`RepaymentsOfLongTermDebt`	$327.24M	USD	Annual
Retirement of Long-Term Debt	`RepaymentsOfLongTermDebt`	$1.05B	USD	Annual
Retirement of Long-Term Debt	`RepaymentsOfLongTermDebt`	$801.08M	USD	Annual
Other Financing Activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$14.27M	USD	Annual
Other Financing Activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-28.46M	USD	Annual
Other Financing Activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-1.01M	USD	Annual
Net Cash Flows Provided by/(Used in) Financing Activities	`NetCashProvidedByUsedInFinancingActivities`	$2.59B	USD	Annual
Net Cash Flows Provided by/(Used in) Financing Activities	`NetCashProvidedByUsedInFinancingActivities`	$1.17B	USD	Annual
Net Cash Flows Provided by/(Used in) Financing Activities	`NetCashProvidedByUsedInFinancingActivities`	$729.94M	USD	Annual
Net Increase/(Decrease) in Cash and Restricted Cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$123.43M	USD	Annual
Net Increase/(Decrease) in Cash and Restricted Cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$-92.26M	USD	Annual
Net Increase/(Decrease) in Cash and Restricted Cash	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$147.89M	USD	Annual
Cash and Restricted Cash - Beginning of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$117.06M	USD	Point-in-time
Cash and Restricted Cash - Beginning of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$264.95M	USD	Point-in-time
Cash and Restricted Cash - Beginning of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$209.32M	USD	Point-in-time
Cash and Restricted Cash - Beginning of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$85.89M	USD	Point-in-time
Cash and Restricted Cash - End of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$117.06M	USD	Point-in-time
Cash and Restricted Cash - End of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$264.95M	USD	Point-in-time
Cash and Restricted Cash - End of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$209.32M	USD	Point-in-time
Cash and Restricted Cash - End of Year	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$85.89M	USD	Point-in-time

Stockholders Equity 41 line items

Line Item	Tag	Value	Unit	Period
Dividends on Common Shares (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$2.02	USD	Annual
Dividends on Common Shares (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$2.14	USD	Annual
Dividends on Common Shares (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$2.27	USD	Annual
Par value of Common Shares (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$5.00	USD	Point-in-time
Par value of Common Shares (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$5.00	USD	Point-in-time
Beginning balance (in shares)	`CommonStockSharesOutstanding`	342.95M	shares	Point-in-time
Beginning balance (in shares)	`CommonStockSharesOutstanding`	329.88M	shares	Point-in-time
Beginning balance	`StockholdersEquity`	$12.63B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$14.06B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$11.49B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$11.09B	USD	Point-in-time
Net Income	`NetIncomeLoss`	$916.57M	USD	Annual
Net Income	`NetIncomeLoss`	$1.04B	USD	Annual
Net Income	`NetIncomeLoss`	$1.21B	USD	Annual
Dividends on Common Stock	`DividendsCommonStock`	$767.50M	USD	Annual
Dividends on Common Stock	`DividendsCommonStock`	$640.11M	USD	Annual
Dividends on Common Stock	`DividendsCommonStock`	$685.98M	USD	Annual
Dividends on Preferred Stock	`DividendsPreferredStock`	$7.52M	USD	Annual
Dividends on Preferred Stock	`DividendsPreferredStock`	$7.52M	USD	Annual
Dividends on Preferred Stock	`DividendsPreferredStock`	$7.52M	USD	Annual
Capital Contributions from Eversource Parent	`NoncontrollingInterestIncreaseinContributionsFromParent`	$225.00M	USD	Annual
Issuance of Common Shares (in shares)	`StockIssuedDuringPeriodSharesNewIssues`	5.96M	shares	Point-in-time
Issuance of Common Shares	`StockIssuedDuringPeriodValueNewIssues`	$949.66M	USD	Annual
Issuance of Common Shares	`StockIssuedDuringPeriodValueNewIssues`	$868.55M	USD	Annual
Long-Term Incentive Plan Activity	`StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures`	$7.89M	USD	Annual
Long-Term Incentive Plan Activity	`StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures`	$3.43M	USD	Annual
Long-Term Incentive Plan Activity	`StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures`	$-543.00K	USD	Annual
Other Changes in Shareholders' Equity	`Otherchangesinshareholdersequity`	$1.82M	USD	Annual
Issuance of Treasury Shares	`StockIssuedDuringPeriodValueTreasuryStockReissued`	$69.47M	USD	Annual
Issuance of Treasury Shares	`StockIssuedDuringPeriodValueTreasuryStockReissued`	$71.89M	USD	Annual
Capital Stock Expense	`AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts`	$20.67M	USD	Annual
Capital Stock Expense	`AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts`	$16.30M	USD	Annual
Other Comprehensive Loss	`OtherComprehensiveIncomeLossNetOfTax`	$-11.35M	USD	Annual
Other Comprehensive Loss	`OtherComprehensiveIncomeLossNetOfTax`	$-5.06M	USD	Annual
Other Comprehensive Loss	`OtherComprehensiveIncomeLossNetOfTax`	$6.40M	USD	Annual
Ending balance (in shares)	`CommonStockSharesOutstanding`	342.95M	shares	Point-in-time
Ending balance (in shares)	`CommonStockSharesOutstanding`	329.88M	shares	Point-in-time
Ending balance	`StockholdersEquity`	$12.63B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$14.06B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$11.49B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$11.09B	USD	Point-in-time

Comprehensive Income 21 line items

Line Item	Tag	Value	Unit	Period
Net Income	`NetIncomeLoss`	$916.57M	USD	Annual
Net Income	`NetIncomeLoss`	$1.04B	USD	Annual
Net Income	`NetIncomeLoss`	$1.21B	USD	Annual
Qualified Cash Flow Hedging Instruments	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$1.60M	USD	Annual
Qualified Cash Flow Hedging Instruments	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$1.39M	USD	Annual
Qualified Cash Flow Hedging Instruments	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax`	$1.76M	USD	Annual
Changes in Unrealized Gains/(Losses) on Marketable Securities	`OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax`	$342.00K	USD	Annual
Changes in Unrealized Gains/(Losses) on Marketable Securities	`OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax`	$1.17M	USD	Annual
Changes in Unrealized Gains/(Losses) on Marketable Securities	`OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax`	$-547.00K	USD	Annual
Change in Funded Status of Pension, SERP and PBOP Benefit Plans	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$7.62M	USD	Annual
Change in Funded Status of Pension, SERP and PBOP Benefit Plans	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-5.19M	USD	Annual
Change in Funded Status of Pension, SERP and PBOP Benefit Plans	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$13.29M	USD	Annual
Other Comprehensive (Loss)/Income, Net of Tax	`OtherComprehensiveIncomeLossNetOfTax`	$-11.35M	USD	Annual
Other Comprehensive (Loss)/Income, Net of Tax	`OtherComprehensiveIncomeLossNetOfTax`	$-5.06M	USD	Annual
Other Comprehensive (Loss)/Income, Net of Tax	`OtherComprehensiveIncomeLossNetOfTax`	$6.40M	USD	Annual
Comprehensive Income Attributable to Noncontrolling Interests	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$7.52M	USD	Annual
Comprehensive Income Attributable to Noncontrolling Interests	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$7.52M	USD	Annual
Comprehensive Income Attributable to Noncontrolling Interests	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$7.52M	USD	Annual
Comprehensive Income Attributable to Common Shareholders	`ComprehensiveIncomeNetOfTax`	$1.04B	USD	Annual
Comprehensive Income Attributable to Common Shareholders	`ComprehensiveIncomeNetOfTax`	$903.99M	USD	Annual
Comprehensive Income Attributable to Common Shareholders	`ComprehensiveIncomeNetOfTax`	$1.19B	USD	Annual

Data is extracted from SEC EDGAR XBRL filings. Values shown are as reported in the filing.