10-K Filing

EVERSOURCE ENERGY CIK: 72741 FY 2017

Filing Information

Form Type	10-K
Accession Number	`0000072741-18-000028`
Period End Date	20171231
Filing Date	20180226
Fiscal Year	2017
Fiscal Period	FY
XBRL Instance	es-20171231.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 80 Income Statement 108 Cash Flow Statement 106 Stockholders Equity 44 Comprehensive Income 29

Balance Sheet 80 line items

Line Item	Tag	Value	Unit	Period
Cash and Cash Equivalents	`Cash`	$38.16M	USD	Point-in-time
Cash and Cash Equivalents	`Cash`	$30.25M	USD	Point-in-time
Cash and Cash Equivalents	`Cash`	$23.95M	USD	Point-in-time
Cash and Cash Equivalents	`Cash`	$38.70M	USD	Point-in-time
Receivables, Net	`AccountsReceivableNetCurrent`	$925.08M	USD	Point-in-time
Receivables, Net	`AccountsReceivableNetCurrent`	$847.30M	USD	Point-in-time
Unbilled Revenues	`CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear`	$201.36M	USD	Point-in-time
Unbilled Revenues	`CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear`	$168.49M	USD	Point-in-time
Fuel, Materials, Supplies and Inventory	`EnergyRelatedInventory`	$223.06M	USD	Point-in-time
Fuel, Materials, Supplies and Inventory	`EnergyRelatedInventory`	$328.72M	USD	Point-in-time
Regulatory Assets	`RegulatoryAssetsCurrent`	$887.62M	USD	Point-in-time
Regulatory Assets	`RegulatoryAssetsCurrent`	$741.87M	USD	Point-in-time
Prepayments and Other Current Assets	`OtherAssetsCurrent`	$138.01M	USD	Point-in-time
Prepayments and Other Current Assets	`OtherAssetsCurrent`	$215.28M	USD	Point-in-time
Assets Held for Sale	`AssetsHeldForSaleNotPartOfDisposalGroupCurrent`	$219.55M	USD	Point-in-time
Assets Held for Sale	`AssetsHeldForSaleNotPartOfDisposalGroupCurrent`	-	USD	Point-in-time
Total Current Assets	`AssetsCurrent`	$2.49B	USD	Point-in-time
Total Current Assets	`AssetsCurrent`	$2.48B	USD	Point-in-time
Property, Plant and Equipment, Net	`PublicUtilitiesPropertyPlantAndEquipmentNet`	$21.35B	USD	Point-in-time
Property, Plant and Equipment, Net	`PublicUtilitiesPropertyPlantAndEquipmentNet`	$23.62B	USD	Point-in-time
Regulatory Assets	`RegulatoryAssetsNoncurrent`	$4.50B	USD	Point-in-time
Regulatory Assets	`RegulatoryAssetsNoncurrent`	$3.64B	USD	Point-in-time
Goodwill	`Goodwill`	$4.43B	USD	Point-in-time
Goodwill	`Goodwill`	$3.52B	USD	Point-in-time
Marketable Securities	`MarketableSecuritiesNoncurrent`	$544.64M	USD	Point-in-time
Marketable Securities	`MarketableSecuritiesNoncurrent`	$585.42M	USD	Point-in-time
Other Long-Term Assets	`OtherAssetsNoncurrent`	$605.69M	USD	Point-in-time
Other Long-Term Assets	`OtherAssetsNoncurrent`	$522.26M	USD	Point-in-time
Total Deferred Debits and Other Assets	`AssetsNoncurrent`	$10.12B	USD	Point-in-time
Total Deferred Debits and Other Assets	`AssetsNoncurrent`	$8.22B	USD	Point-in-time
Total Assets	`Assets`	$32.05B	USD	Point-in-time
Total Assets	`Assets`	$36.22B	USD	Point-in-time
Notes Payable	`NotesPayable`	$1.15B	USD	Point-in-time
Notes Payable	`NotesPayable`	$1.09B	USD	Point-in-time
Long-Term Debt Current Portion	`LongTermDebtCurrent`	$549.63M	USD	Point-in-time
Long-Term Debt Current Portion	`LongTermDebtCurrent`	$773.88M	USD	Point-in-time
Accounts Payable	`AccountsPayableCurrent`	$1.09B	USD	Point-in-time
Accounts Payable	`AccountsPayableCurrent`	$884.52M	USD	Point-in-time
Regulatory Liabilities	`RegulatoryLiabilityCurrent`	$128.07M	USD	Point-in-time
Regulatory Liabilities	`RegulatoryLiabilityCurrent`	$146.79M	USD	Point-in-time
Other Current Liabilities	`OtherLiabilitiesCurrent`	$738.22M	USD	Point-in-time
Other Current Liabilities	`OtherLiabilitiesCurrent`	$684.91M	USD	Point-in-time
Total Current Liabilities	`LiabilitiesCurrent`	$3.59B	USD	Point-in-time
Total Current Liabilities	`LiabilitiesCurrent`	$3.64B	USD	Point-in-time
Accumulated Deferred Income Taxes	`DeferredTaxLiabilitiesNoncurrent`	$3.30B	USD	Point-in-time
Accumulated Deferred Income Taxes	`DeferredTaxLiabilitiesNoncurrent`	$5.61B	USD	Point-in-time
Regulatory Liabilities	`RegulatoryLiabilityNoncurrent`	$702.25M	USD	Point-in-time
Regulatory Liabilities	`RegulatoryLiabilityNoncurrent`	$3.64B	USD	Point-in-time
Derivative Liabilities	`DerivativeLiabilitiesNoncurrent`	$413.68M	USD	Point-in-time
Derivative Liabilities	`DerivativeLiabilitiesNoncurrent`	$377.26M	USD	Point-in-time
Accrued Pension, SERP and PBOP	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$1.14B	USD	Point-in-time
Accrued Pension, SERP and PBOP	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$1.23B	USD	Point-in-time
Other Long-Term Liabilities	`OtherLiabilitiesNoncurrent`	$1.07B	USD	Point-in-time
Other Long-Term Liabilities	`OtherLiabilitiesNoncurrent`	$853.26M	USD	Point-in-time
Total Deferred Credits and Other Liabilities	`LiabilitiesNoncurrent`	$9.61B	USD	Point-in-time
Total Deferred Credits and Other Liabilities	`LiabilitiesNoncurrent`	$8.72B	USD	Point-in-time
Long-Term Debt	`LongTermDebtNoncurrent`	$8.83B	USD	Point-in-time
Long-Term Debt	`LongTermDebtNoncurrent`	$11.78B	USD	Point-in-time
Preferred Stock Not Subject to Mandatory Redemption	`RedeemableNoncontrollingInterestEquityPreferredCarryingAmount`	$155.57M	USD	Point-in-time
Preferred Stock Not Subject to Mandatory Redemption	`RedeemableNoncontrollingInterestEquityPreferredCarryingAmount`	$155.57M	USD	Point-in-time
Common Shares	`CommonStockValue`	$1.67B	USD	Point-in-time
Common Shares	`CommonStockValue`	$1.67B	USD	Point-in-time
Capital Surplus, Paid In	`AdditionalPaidInCapital`	$6.24B	USD	Point-in-time
Capital Surplus, Paid In	`AdditionalPaidInCapital`	$6.25B	USD	Point-in-time
Retained Earnings	`RetainedEarningsAccumulatedDeficit`	$3.18B	USD	Point-in-time
Retained Earnings	`RetainedEarningsAccumulatedDeficit`	$3.56B	USD	Point-in-time
Accumulated Other Comprehensive Loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-66.40M	USD	Point-in-time
Accumulated Other Comprehensive Loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-65.28M	USD	Point-in-time
Treasury Stock	`TreasuryStockValue`	$317.77M	USD	Point-in-time
Treasury Stock	`TreasuryStockValue`	$317.77M	USD	Point-in-time
Common Shareholders' Equity	`StockholdersEquity`	$11.09B	USD	Point-in-time
Common Shareholders' Equity	`StockholdersEquity`	$10.71B	USD	Point-in-time
Common Shareholders' Equity	`StockholdersEquity`	$9.98B	USD	Point-in-time
Common Shareholders' Equity	`StockholdersEquity`	$10.35B	USD	Point-in-time
Total Capitalization	`CapitalizationLongtermDebtAndEquity`	$23.02B	USD	Point-in-time
Total Capitalization	`CapitalizationLongtermDebtAndEquity`	$19.70B	USD	Point-in-time
Commitments and Contingencies (Note 11)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Commitments and Contingencies (Note 11)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Total Liabilities and Capitalization	`LiabilitiesAndStockholdersEquity`	$36.22B	USD	Point-in-time
Total Liabilities and Capitalization	`LiabilitiesAndStockholdersEquity`	$32.05B	USD	Point-in-time

Income Statement 108 line items

Line Item	Tag	Value	Unit	Period
Operating Revenues	`Revenues`	$2.11B	USD	1 Quarter
Operating Revenues	`Revenues`	$2.04B	USD	1 Quarter
Operating Revenues	`Revenues`	$1.99B	USD	1 Quarter
Operating Revenues	`Revenues`	$1.77B	USD	1 Quarter
Operating Revenues	`Revenues`	$7.95B	USD	Annual
Operating Revenues	`Revenues`	$7.64B	USD	Annual
Operating Revenues	`Revenues`	$2.06B	USD	1 Quarter
Operating Revenues	`Revenues`	$1.76B	USD	1 Quarter
Operating Revenues	`Revenues`	$1.90B	USD	1 Quarter
Operating Revenues	`Revenues`	$1.78B	USD	1 Quarter
Operating Revenues	`Revenues`	$7.75B	USD	Annual
Purchased Power, Fuel and Transmission	`CostOfPurchasedPower`	$2.54B	USD	Annual
Purchased Power, Fuel and Transmission	`CostOfPurchasedPower`	$3.09B	USD	Annual
Purchased Power, Fuel and Transmission	`CostOfPurchasedPower`	$2.50B	USD	Annual
Operations and Maintenance	`UtilitiesOperatingExpenseMaintenanceAndOperations`	$1.28B	USD	Annual
Operations and Maintenance	`UtilitiesOperatingExpenseMaintenanceAndOperations`	$1.32B	USD	Annual
Operations and Maintenance	`UtilitiesOperatingExpenseMaintenanceAndOperations`	$1.33B	USD	Annual
Depreciation	`Depreciation`	$665.86M	USD	Annual
Depreciation	`Depreciation`	$715.47M	USD	Annual
Depreciation	`Depreciation`	$773.80M	USD	Annual
Amortization of Regulatory Assets, Net	`AmortizationOfRegulatoryAsset`	$71.70M	USD	Annual
Amortization of Regulatory Assets, Net	`AmortizationOfRegulatoryAsset`	$89.99M	USD	Annual
Amortization of Regulatory Assets, Net	`AmortizationOfRegulatoryAsset`	$22.34M	USD	Annual
Energy Efficiency Programs	`EnergyEfficiencyPrograms`	$533.66M	USD	Annual
Energy Efficiency Programs	`EnergyEfficiencyPrograms`	$480.83M	USD	Annual
Energy Efficiency Programs	`EnergyEfficiencyPrograms`	$495.70M	USD	Annual
Taxes Other Than Income Taxes	`TaxesExcludingIncomeAndExciseTaxes`	$676.76M	USD	Annual
Taxes Other Than Income Taxes	`TaxesExcludingIncomeAndExciseTaxes`	$634.07M	USD	Annual
Taxes Other Than Income Taxes	`TaxesExcludingIncomeAndExciseTaxes`	$590.57M	USD	Annual
Total Operating Expenses	`OperatingExpenses`	$5.83B	USD	Annual
Total Operating Expenses	`OperatingExpenses`	$6.19B	USD	Annual
Total Operating Expenses	`OperatingExpenses`	$5.78B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$423.40M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$450.90M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$509.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$1.76B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$438.10M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$509.90M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$1.92B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$1.86B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$502.60M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$455.70M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$488.50M	USD	1 Quarter
Interest Expense	`InterestExpense`	$372.42M	USD	Annual
Interest Expense	`InterestExpense`	$421.75M	USD	Annual
Interest Expense	`InterestExpense`	$400.96M	USD	Annual
Other Income, Net	`NonoperatingIncomeExpense`	$45.92M	USD	Annual
Other Income, Net	`NonoperatingIncomeExpense`	$34.23M	USD	Annual
Other Income, Net	`NonoperatingIncomeExpense`	$78.01M	USD	Annual
Income Before Income Tax Expense	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic`	$1.50B	USD	Annual
Income Before Income Tax Expense	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic`	$1.43B	USD	Annual
Income Before Income Tax Expense	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic`	$1.57B	USD	Annual
Income Tax Expense	`IncomeTaxExpenseBenefit`	$578.89M	USD	Annual
Income Tax Expense	`IncomeTaxExpenseBenefit`	$555.00M	USD	Annual
Income Tax Expense	`IncomeTaxExpenseBenefit`	$539.97M	USD	Annual
Net Income	`NetIncomeLoss`	$261.30M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$267.20M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$262.20M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$205.50M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$232.60M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$995.51M	USD	Annual
Net Income	`NetIncomeLoss`	$886.00M	USD	Annual
Net Income	`NetIncomeLoss`	$239.40M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$246.00M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$231.10M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$949.82M	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`	$244.20M	USD	1 Quarter
Net Income Attributable to Common Shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$942.30M	USD	Annual
Net Income Attributable to Common Shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$237.40M	USD	1 Quarter
Net Income Attributable to Common Shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$203.60M	USD	1 Quarter
Net Income Attributable to Common Shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$988.00M	USD	Annual
Net Income Attributable to Common Shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$230.70M	USD	1 Quarter
Net Income Attributable to Common Shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$229.20M	USD	1 Quarter
Net Income Attributable to Common Shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$878.49M	USD	Annual
Net Income Attributable to Common Shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$260.40M	USD	1 Quarter
Net Income Attributable to Common Shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$265.30M	USD	1 Quarter
Net Income Attributable to Common Shareholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$259.50M	USD	1 Quarter
Basic Earnings Per Common Share (in dollars per share)	`EarningsPerShareBasic`	$0.64	USD	1 Quarter
Basic Earnings Per Common Share (in dollars per share)	`EarningsPerShareBasic`	$0.82	USD	1 Quarter
Basic Earnings Per Common Share (in dollars per share)	`EarningsPerShareBasic`	$0.73	USD	1 Quarter
Basic Earnings Per Common Share (in dollars per share)	`EarningsPerShareBasic`	$0.82	USD	1 Quarter
Basic Earnings Per Common Share (in dollars per share)	`EarningsPerShareBasic`	$0.75	USD	1 Quarter
Basic Earnings Per Common Share (in dollars per share)	`EarningsPerShareBasic`	$2.97	USD	Annual
Basic Earnings Per Common Share (in dollars per share)	`EarningsPerShareBasic`	$2.77	USD	Annual
Basic Earnings Per Common Share (in dollars per share)	`EarningsPerShareBasic`	$0.77	USD	1 Quarter
Basic Earnings Per Common Share (in dollars per share)	`EarningsPerShareBasic`	$3.11	USD	Annual
Basic Earnings Per Common Share (in dollars per share)	`EarningsPerShareBasic`	$0.83	USD	1 Quarter
Basic Earnings Per Common Share (in dollars per share)	`EarningsPerShareBasic`	$0.72	USD	1 Quarter
Diluted Earnings Per Common Share (in dollars per share)	`EarningsPerShareDiluted`	$2.76	USD	Annual
Diluted Earnings Per Common Share (in dollars per share)	`EarningsPerShareDiluted`	$0.64	USD	1 Quarter
Diluted Earnings Per Common Share (in dollars per share)	`EarningsPerShareDiluted`	$0.82	USD	1 Quarter
Diluted Earnings Per Common Share (in dollars per share)	`EarningsPerShareDiluted`	$0.75	USD	1 Quarter
Diluted Earnings Per Common Share (in dollars per share)	`EarningsPerShareDiluted`	$0.73	USD	1 Quarter
Diluted Earnings Per Common Share (in dollars per share)	`EarningsPerShareDiluted`	$0.72	USD	1 Quarter
Diluted Earnings Per Common Share (in dollars per share)	`EarningsPerShareDiluted`	$0.82	USD	1 Quarter
Diluted Earnings Per Common Share (in dollars per share)	`EarningsPerShareDiluted`	$0.77	USD	1 Quarter
Diluted Earnings Per Common Share (in dollars per share)	`EarningsPerShareDiluted`	$2.96	USD	Annual
Diluted Earnings Per Common Share (in dollars per share)	`EarningsPerShareDiluted`	$0.83	USD	1 Quarter
Diluted Earnings Per Common Share (in dollars per share)	`EarningsPerShareDiluted`	$3.11	USD	Annual
Basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	317.65M	shares	Annual
Basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	317.41M	shares	Annual
Basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	317.34M	shares	Annual
Diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	318.43M	shares	Annual
Diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	318.03M	shares	Annual
Diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	318.45M	shares	Annual

Cash Flow Statement 106 line items

Line Item	Tag	Value	Unit	Period
Net Income	`NetIncomeLoss`	$261.30M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$267.20M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$262.20M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$205.50M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$232.60M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$995.51M	USD	Annual
Net Income	`NetIncomeLoss`	$886.00M	USD	Annual
Net Income	`NetIncomeLoss`	$239.40M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$246.00M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$231.10M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$949.82M	USD	Annual
Depreciation	`Depreciation`	$665.86M	USD	Annual
Depreciation	`Depreciation`	$715.47M	USD	Annual
Depreciation	`Depreciation`	$773.80M	USD	Annual
Deferred Income Taxes	`DeferredIncomeTaxExpenseBenefit`	$466.46M	USD	Annual
Deferred Income Taxes	`DeferredIncomeTaxExpenseBenefit`	$491.63M	USD	Annual
Deferred Income Taxes	`DeferredIncomeTaxExpenseBenefit`	$491.74M	USD	Annual
Pension, SERP and PBOP Expense	`PensionAndOtherPostretirementBenefitExpense`	$96.02M	USD	Annual
Pension, SERP and PBOP Expense	`PensionAndOtherPostretirementBenefitExpense`	$39.91M	USD	Annual
Pension, SERP and PBOP Expense	`PensionAndOtherPostretirementBenefitExpense`	$22.45M	USD	Annual
Pension and PBOP Contributions	`PensionAndOtherPostretirementBenefitContributions`	$242.80M	USD	Annual
Pension and PBOP Contributions	`PensionAndOtherPostretirementBenefitContributions`	$158.74M	USD	Annual
Pension and PBOP Contributions	`PensionAndOtherPostretirementBenefitContributions`	$162.45M	USD	Annual
Regulatory (Under)/Over Recoveries, Net	`IncreaseDecreaseInRegulatoryAssetsAndLiabilities`	$163.29M	USD	Annual
Regulatory (Under)/Over Recoveries, Net	`IncreaseDecreaseInRegulatoryAssetsAndLiabilities`	$47.94M	USD	Annual
Regulatory (Under)/Over Recoveries, Net	`IncreaseDecreaseInRegulatoryAssetsAndLiabilities`	$-13.34M	USD	Annual
Amortization of Regulatory Assets, Net	`AmortizationOfRegulatoryAsset`	$71.70M	USD	Annual
Amortization of Regulatory Assets, Net	`AmortizationOfRegulatoryAsset`	$89.99M	USD	Annual
Amortization of Regulatory Assets, Net	`AmortizationOfRegulatoryAsset`	$22.34M	USD	Annual
Refunds/(Payments) Related to Spent Nuclear Fuel, Net	`PaymentsRefundsRelatedtoSpentNuclearFuel`	$-297.25M	USD	Annual
Refunds/(Payments) Related to Spent Nuclear Fuel, Net	`PaymentsRefundsRelatedtoSpentNuclearFuel`	$59.80M	USD	Annual
Refunds/(Payments) Related to Spent Nuclear Fuel, Net	`PaymentsRefundsRelatedtoSpentNuclearFuel`	-	USD	Annual
Other	`OtherNoncashIncomeExpense`	$148.43M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$77.29M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$82.22M	USD	Annual
Receivables and Unbilled Revenues, Net	`IncreaseDecreaseInReceivables`	$142.70M	USD	Annual
Receivables and Unbilled Revenues, Net	`IncreaseDecreaseInReceivables`	$39.80M	USD	Annual
Receivables and Unbilled Revenues, Net	`IncreaseDecreaseInReceivables`	$117.16M	USD	Annual
Fuel, Materials, Supplies and Inventory	`IncreaseDecreaseInInventories`	$-34.11M	USD	Annual
Fuel, Materials, Supplies and Inventory	`IncreaseDecreaseInInventories`	$9.22M	USD	Annual
Fuel, Materials, Supplies and Inventory	`IncreaseDecreaseInInventories`	$-7.75M	USD	Annual
Taxes Receivable/Accrued, Net	`IncreaseDecreaseInIncomeTaxesReceivable`	$-30.28M	USD	Annual
Taxes Receivable/Accrued, Net	`IncreaseDecreaseInIncomeTaxesReceivable`	$-52.28M	USD	Annual
Taxes Receivable/Accrued, Net	`IncreaseDecreaseInIncomeTaxesReceivable`	$-234.54M	USD	Annual
Accounts Payable	`IncreaseDecreaseInAccountsPayable`	$56.07M	USD	Annual
Accounts Payable	`IncreaseDecreaseInAccountsPayable`	$-91.62M	USD	Annual
Accounts Payable	`IncreaseDecreaseInAccountsPayable`	$-14.13M	USD	Annual
Other Current Assets and Liabilities, Net	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-44.03M	USD	Annual
Other Current Assets and Liabilities, Net	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-88.74M	USD	Annual
Other Current Assets and Liabilities, Net	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-9.11M	USD	Annual
Net Cash Flows Provided by Operating Activities	`NetCashProvidedByUsedInOperatingActivities`	$2.00B	USD	Annual
Net Cash Flows Provided by Operating Activities	`NetCashProvidedByUsedInOperatingActivities`	$1.43B	USD	Annual
Net Cash Flows Provided by Operating Activities	`NetCashProvidedByUsedInOperatingActivities`	$2.18B	USD	Annual
Investments in Property, Plant and Equipment	`PaymentsToAcquirePropertyPlantAndEquipment`	$1.98B	USD	Annual
Investments in Property, Plant and Equipment	`PaymentsToAcquirePropertyPlantAndEquipment`	$2.35B	USD	Annual
Investments in Property, Plant and Equipment	`PaymentsToAcquirePropertyPlantAndEquipment`	$1.72B	USD	Annual
Proceeds from Sales of Marketable Securities	`ProceedsFromSaleAndMaturityOfMarketableSecurities`	$832.90M	USD	Annual
Proceeds from Sales of Marketable Securities	`ProceedsFromSaleAndMaturityOfMarketableSecurities`	$659.34M	USD	Annual
Proceeds from Sales of Marketable Securities	`ProceedsFromSaleAndMaturityOfMarketableSecurities`	$799.16M	USD	Annual
Purchases of Marketable Securities	`PaymentsToAcquireMarketableSecurities`	$810.51M	USD	Annual
Purchases of Marketable Securities	`PaymentsToAcquireMarketableSecurities`	$681.27M	USD	Annual
Purchases of Marketable Securities	`PaymentsToAcquireMarketableSecurities`	$717.11M	USD	Annual
Acquisition of Aquarion	`PaymentsToAcquireBusinessesGross`	-	USD	Annual
Acquisition of Aquarion	`PaymentsToAcquireBusinessesGross`	-	USD	Annual
Acquisition of Aquarion	`PaymentsToAcquireBusinessesGross`	$877.65M	USD	Annual
Payments to Acquire Investments	`PaymentsToAcquireInvestments`	$23.35M	USD	Annual
Payments to Acquire Investments	`PaymentsToAcquireInvestments`	$32.63M	USD	Annual
Payments to Acquire Investments	`PaymentsToAcquireInvestments`	$188.96M	USD	Annual
Other Investing Activities	`PaymentsForProceedsFromOtherInvestingActivities`	$-25.52M	USD	Annual
Other Investing Activities	`PaymentsForProceedsFromOtherInvestingActivities`	$-36.95M	USD	Annual
Other Investing Activities	`PaymentsForProceedsFromOtherInvestingActivities`	$-6.29M	USD	Annual
Net Cash Flows Used in Investing Activities	`NetCashProvidedByUsedInInvestingActivities`	$-3.21B	USD	Annual
Net Cash Flows Used in Investing Activities	`NetCashProvidedByUsedInInvestingActivities`	$-2.15B	USD	Annual
Net Cash Flows Used in Investing Activities	`NetCashProvidedByUsedInInvestingActivities`	$-1.66B	USD	Annual
Cash Dividends on Common Shares	`PaymentsOfDividendsCommonStock`	$602.08M	USD	Annual
Cash Dividends on Common Shares	`PaymentsOfDividendsCommonStock`	$529.79M	USD	Annual
Cash Dividends on Common Shares	`PaymentsOfDividendsCommonStock`	$564.49M	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/(Decrease) in Short-Term Debt	`ProceedsFromRepaymentsOfShortTermDebt`	$72.81M	USD	Annual
Increase/(Decrease) in Short-Term Debt	`ProceedsFromRepaymentsOfShortTermDebt`	$-12.45M	USD	Annual
Increase/(Decrease) in Short-Term Debt	`ProceedsFromRepaymentsOfShortTermDebt`	$-242.12M	USD	Annual
Issuance of Long-Term Debt	`ProceedsFromIssuanceOfLongTermDebt`	$2.50B	USD	Annual
Issuance of Long-Term Debt	`ProceedsFromIssuanceOfLongTermDebt`	$800.00M	USD	Annual
Issuance of Long-Term Debt	`ProceedsFromIssuanceOfLongTermDebt`	$1.23B	USD	Annual
Retirements of Long-Term Debt	`RepaymentsOfLongTermDebt`	$200.00M	USD	Annual
Retirements of Long-Term Debt	`RepaymentsOfLongTermDebt`	$216.70M	USD	Annual
Retirements of Long-Term Debt	`RepaymentsOfLongTermDebt`	$745.00M	USD	Annual
Other Financing Activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-33.48M	USD	Annual
Other Financing Activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-4.75M	USD	Annual
Other Financing Activities	`ProceedsFromPaymentsForOtherFinancingActivities`	$-18.23M	USD	Annual
Net Cash Flows Provided by/(Used in) Financing Activities	`NetCashProvidedByUsedInFinancingActivities`	$1.21B	USD	Annual
Net Cash Flows Provided by/(Used in) Financing Activities	`NetCashProvidedByUsedInFinancingActivities`	$-17.94M	USD	Annual
Net Cash Flows Provided by/(Used in) Financing Activities	`NetCashProvidedByUsedInFinancingActivities`	$210.64M	USD	Annual
Net Increase/(Decrease) in Cash and Cash Equivalents	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$6.30M	USD	Annual
Net Increase/(Decrease) in Cash and Cash Equivalents	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$7.91M	USD	Annual
Net Increase/(Decrease) in Cash and Cash Equivalents	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$-14.76M	USD	Annual
Cash and Cash Equivalents - Beginning of Year	`Cash`	$38.16M	USD	Point-in-time
Cash and Cash Equivalents - Beginning of Year	`Cash`	$30.25M	USD	Point-in-time
Cash and Cash Equivalents - Beginning of Year	`Cash`	$23.95M	USD	Point-in-time
Cash and Cash Equivalents - Beginning of Year	`Cash`	$38.70M	USD	Point-in-time
Cash and Cash Equivalents - End of Year	`Cash`	$38.16M	USD	Point-in-time
Cash and Cash Equivalents - End of Year	`Cash`	$30.25M	USD	Point-in-time
Cash and Cash Equivalents - End of Year	`Cash`	$23.95M	USD	Point-in-time
Cash and Cash Equivalents - End of Year	`Cash`	$38.70M	USD	Point-in-time

Stockholders Equity 44 line items

Line Item	Tag	Value	Unit	Period
Dividends on common shares (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$1.78	USD	Annual
Dividends on common shares (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$1.67	USD	Annual
Dividends on common shares (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$1.90	USD	Annual
Per share par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$5.00	USD	Point-in-time
Per share par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$5.00	USD	Point-in-time
Per share par value (in dollars per share)	`CommonStockParOrStatedValuePerShare`	$5.00	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$11.09B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$10.71B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$9.98B	USD	Point-in-time
Beginning balance	`StockholdersEquity`	$10.35B	USD	Point-in-time
Net Income	`NetIncomeLoss`	$261.30M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$267.20M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$262.20M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$205.50M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$232.60M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$995.51M	USD	Annual
Net Income	`NetIncomeLoss`	$886.00M	USD	Annual
Net Income	`NetIncomeLoss`	$239.40M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$246.00M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$231.10M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$949.82M	USD	Annual
Dividends on Common Stock	`DividendsCommonStock`	$602.08M	USD	Annual
Dividends on Common Stock	`DividendsCommonStock`	$564.49M	USD	Annual
Dividends on Common Stock	`DividendsCommonStock`	$529.79M	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
Issuance of Common Shares	`StockIssuedDuringPeriodValueNewIssues`	$9.47M	USD	Annual
Issuance of Common Shares	`StockIssuedDuringPeriodValueNewIssues`	$-5.56M	USD	Annual
Long-Term Incentive Plan Activity	`StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures`	$-6.06M	USD	Annual
Long-Term Incentive Plan Activity	`StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures`	$-10.83M	USD	Annual
Long-Term Incentive Plan Activity	`StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures`	$-6.14M	USD	Annual
Increase in Treasury Shares	`StockIssuedDuringPeriodValueTreasuryStockReissued`	$-7.79M	USD	Annual
Increase in Treasury Shares	`StockIssuedDuringPeriodValueTreasuryStockReissued`	$12.56M	USD	Annual
Other Changes in Shareholders' Equity	`Otherchangesinshareholdersequity`	$550.00K	USD	Annual
Other Changes in Shareholders' Equity	`Otherchangesinshareholdersequity`	$3.65M	USD	Annual
Other Changes in Shareholders' Equity	`Otherchangesinshareholdersequity`	$-449.00K	USD	Annual
Other Comprehensive Income	`OtherComprehensiveIncomeLossNetOfTax`	$7.17M	USD	Annual
Other Comprehensive Income	`OtherComprehensiveIncomeLossNetOfTax`	$1.56M	USD	Annual
Other Comprehensive Income	`OtherComprehensiveIncomeLossNetOfTax`	$-1.12M	USD	Annual
Ending balance	`StockholdersEquity`	$11.09B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$10.71B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$9.98B	USD	Point-in-time
Ending balance	`StockholdersEquity`	$10.35B	USD	Point-in-time

Comprehensive Income 29 line items

Line Item	Tag	Value	Unit	Period
Net Income	`NetIncomeLoss`	$261.30M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$267.20M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$262.20M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$205.50M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$232.60M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$995.51M	USD	Annual
Net Income	`NetIncomeLoss`	$886.00M	USD	Annual
Net Income	`NetIncomeLoss`	$239.40M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$246.00M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$231.10M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$949.82M	USD	Annual
Qualified Cash Flow Hedging Instruments	`OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax`	$2.14M	USD	Annual
Qualified Cash Flow Hedging Instruments	`OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax`	$1.97M	USD	Annual
Qualified Cash Flow Hedging Instruments	`OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax`	$2.08M	USD	Annual
Changes in Unrealized (Losses)/Gains on Marketable Securities	`OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax`	$-350.00K	USD	Annual
Changes in Unrealized (Losses)/Gains on Marketable Securities	`OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax`	$-2.59M	USD	Annual
Changes in Unrealized (Losses)/Gains on Marketable Securities	`OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax`	$2.29M	USD	Annual
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$2.87M	USD	Annual
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$-7.67M	USD	Annual
Changes in Funded Status of Pension, SERP and PBOP Benefit Plans	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax`	$2.75M	USD	Annual
Other Comprehensive (Loss)/Income, Net of Tax	`OtherComprehensiveIncomeLossNetOfTax`	$7.17M	USD	Annual
Other Comprehensive (Loss)/Income, Net of Tax	`OtherComprehensiveIncomeLossNetOfTax`	$1.56M	USD	Annual
Other Comprehensive (Loss)/Income, Net of Tax	`OtherComprehensiveIncomeLossNetOfTax`	$-1.12M	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	`ComprehensiveIncomeNetOfTax`	$943.86M	USD	Annual
Comprehensive Income	`ComprehensiveIncomeNetOfTax`	$885.65M	USD	Annual
Comprehensive Income	`ComprehensiveIncomeNetOfTax`	$986.88M	USD	Annual

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