$ES
Eversource Energy Stock $es

$es Overview Financials Valuation SEC Filings Company Website

2015 Q4 Form 10-K Financial Statement

#000007274117000007 Filed on February 23, 2017

Income Statement

Concept	2015 Q4	2015 Q3	2015 Q2
Revenue	$1.691B	$1.933B	$1.817B
YoY Change	-10.1%	2.15%	8.32%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$170.5M	$151.0M	$163.7M
YoY Change	7.57%	-1.44%	7.53%
% of Gross Profit
Operating Expenses	$1.306B	$1.464B	$1.405B
YoY Change	-10.0%	0.85%	1.55%
Operating Profit	$385.5M	$469.2M	$412.0M
YoY Change	-10.39%	6.42%	40.14%
Interest Expense	-$92.80M	$92.53M	$92.26M
YoY Change	3.23%	3.12%	-0.26%
% of Operating Profit	-24.07%	19.72%	22.39%
Other Income/Expense, Net	$10.40M	$5.200M	$12.90M
YoY Change	85.71%	-56.16%	133.42%
Pretax Income	$303.0M	$381.9M	$332.7M
YoY Change	-12.4%	5.21%	60.69%
Income Tax	$119.3M	$144.1M	$123.3M
% Of Pretax Income	39.37%	37.74%	37.06%
Net Earnings	$183.7M	$237.8M	$209.4M
YoY Change	-17.84%	0.55%	62.07%
Net Earnings / Revenue	10.86%	12.3%	11.52%
Basic Earnings Per Share	$0.57	$0.74	$0.65
Diluted Earnings Per Share	$0.57	$0.74	$0.65
COMMON SHARES
Basic Shares Outstanding		317.5M shares	317.6M shares
Diluted Shares Outstanding		318.4M shares	318.6M shares

Balance Sheet

Concept	2015 Q4	2015 Q3	2015 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$24.00M	$155.0M	$161.0M
YoY Change	-38.46%	-0.64%	7.33%
Cash & Equivalents	$68.00M	$36.00M	$36.00M
Short-Term Investments		$120.0M	$125.0M
Other Short-Term Assets	$129.0M	$970.0M	$62.88M
YoY Change	-88.38%	27.3%	-92.41%
Inventory	$336.0M	$302.0M	$290.0M
Prepaid Expenses
Receivables	$775.5M	$928.0M	$903.6M
Other Receivables	$306.0M	$12.00M	$117.0M
Total Short-Term Assets	$2.619B	$2.368B	$2.450B
YoY Change	-2.72%	12.65%	18.47%
LONG-TERM ASSETS
Property, Plant & Equipment	$19.89B	$19.41B	$19.08B
YoY Change	6.68%	6.31%	6.12%
Goodwill	$3.519B		$3.519B
YoY Change	0.0%
Intangibles
YoY Change
Long-Term Investments	$48.00M	$477.0M	$498.0M
YoY Change	-90.68%	-7.92%	-3.11%
Other Assets	$295.2M	$4.276B	$316.8M
YoY Change	-5.48%	19.14%	-91.46%
Total Long-Term Assets	$8.069B	$27.68B	$8.351B
YoY Change	-3.95%	6.95%	-67.53%
TOTAL ASSETS
Total Short-Term Assets	$2.619B	$2.368B	$2.450B
Total Long-Term Assets	$8.069B	$27.68B	$8.351B
Total Assets	$30.58B	$30.05B	$29.88B
YoY Change	2.82%	7.38%	7.52%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$813.6M	$769.0M	$599.0M
YoY Change	-6.29%	26.27%	6.58%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$1.161B	$1.016B	$954.0M
YoY Change	21.32%	-2.96%	5.41%
Long-Term Debt Due	$228.9M	$229.0M	$278.9M
YoY Change	-6.8%	-6.91%	-29.58%
Total Short-Term Liabilities	$2.990B	$2.972B	$2.839B
YoY Change	-4.61%	1.43%	1.28%
LONG-TERM LIABILITIES
Long-Term Debt	$8.806B	$8.757B	$8.690B
YoY Change	2.32%	7.22%	6.66%
Other Long-Term Liabilities	$871.5M	$3.254B	$876.0M
YoY Change	-0.33%	26.03%	-67.08%
Total Long-Term Liabilities	$8.277B	$12.01B	$8.011B
YoY Change	4.71%	11.74%	-25.88%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.990B	$2.972B	$2.839B
Total Long-Term Liabilities	$8.277B	$12.01B	$8.011B
Total Liabilities	$11.27B	$19.60B	$19.54B
YoY Change	2.06%	9.26%	9.27%
SHAREHOLDERS EQUITY
Retained Earnings	$2.797B		$2.644B
YoY Change	14.24%
Common Stock	$1.669B		$1.669B
YoY Change	0.15%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$310.0M		-$310.0M
YoY Change	-203.17%
Treasury Stock Shares	16.67M shares	16.67M shares	16.67M shares
Shareholders Equity	$10.35B	$10.45B	$10.19B
YoY Change
Total Liabilities & Shareholders Equity	$30.58B	$30.05B	$29.88B
YoY Change	2.69%	7.38%	7.52%

Cashflow Statement

Concept	2015 Q4	2015 Q3	2015 Q2
OPERATING ACTIVITIES
Net Income	$183.7M	$237.8M	$209.4M
YoY Change	-17.84%	0.55%	62.07%
Depreciation, Depletion And Amortization	$170.5M	$151.0M	$163.7M
YoY Change	7.57%	-1.44%	7.53%
Cash From Operating Activities	$92.20M	$476.3M	$373.8M
YoY Change	-62.82%	-6.11%	-7.22%
INVESTING ACTIVITIES
Capital Expenditures	-$546.8M	-$436.9M	-$377.8M
YoY Change	12.46%	11.03%	0.67%
Acquisitions
YoY Change
Other Investing Activities	$46.20M	-$5.800M	$26.50M
YoY Change	162.5%	-30.12%	419.61%
Cash From Investing Activities	-$500.7M	-$442.7M	-$351.3M
YoY Change	6.85%	10.18%	-5.11%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	396.6M	-34.30M	-57.00M
YoY Change	82.18%	-65.0%	-34.93%
NET CHANGE
Cash From Operating Activities	92.20M	476.3M	373.8M
Cash From Investing Activities	-500.7M	-442.7M	-351.3M
Cash From Financing Activities	396.6M	-34.30M	-57.00M
Net Change In Cash	-11.90M	-700.0K	-34.50M
YoY Change	310.34%	-109.33%	-37.16%
FREE CASH FLOW
Cash From Operating Activities	$92.20M	$476.3M	$373.8M
Capital Expenditures	-$546.8M	-$436.9M	-$377.8M
Free Cash Flow	$639.0M	$913.2M	$751.6M
YoY Change	-12.97%	1.38%	-3.42%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2016	dei	Amendment Flag AmendmentFlag	false
CY2016	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2016	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2016	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2016
CY2016	dei	Document Period End Date DocumentPeriodEndDate	2016-12-31
CY2016	dei	Document Type DocumentType	10-K
CY2016	dei	Entity Central Index Key EntityCentralIndexKey	0000072741
CY2017Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	316885808	shares
CY2016	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2016	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2016Q2	dei	Entity Public Float EntityPublicFloat	18939770997	USD
CY2016	dei	Entity Registrant Name EntityRegistrantName	EVERSOURCE ENERGY
CY2016	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2016	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2016	es	Amountof Capacity Provided Under Capacity Contract AmountofCapacityProvidedUnderCapacityContract	787	MW
CY2016Q4	es	Amountof Debt Authorized AmountofDebtAuthorized	125000000	USD
CY2015	es	Amountof Natural Gas To Be Purchased Under Futures Contracts AmountofNaturalGasToBePurchasedUnderFuturesContracts	9100000	MMBTU
CY2015	es	Energy Efficiency Programs EnergyEfficiencyPrograms	495701000	USD
CY2016	es	Energy Efficiency Programs EnergyEfficiencyPrograms	533659000	USD
CY2016	es	Amountof Natural Gas To Be Purchased Under Futures Contracts AmountofNaturalGasToBePurchasedUnderFuturesContracts	9200000	MMBTU
CY2016Q4	es	Available For Sale Securities Subject To New Accounting Guidance AvailableForSaleSecuritiesSubjectToNewAccountingGuidance	48000000	USD
CY2014Q4	es	Deferred Compensation Cash Based Arrangements Expense Pertaining To Deferred Benefits DeferredCompensationCashBasedArrangementsExpensePertainingToDeferredBenefits	4500000	USD
CY2015Q4	es	Deferred Compensation Cash Based Arrangements Expense Pertaining To Deferred Benefits DeferredCompensationCashBasedArrangementsExpensePertainingToDeferredBenefits	3900000	USD
CY2016Q4	es	Deferred Compensation Cash Based Arrangements Expense Pertaining To Deferred Benefits DeferredCompensationCashBasedArrangementsExpensePertainingToDeferredBenefits	2900000	USD
CY2015Q4	es	Deferred Tax Assets Tax Effect Tax Regulatory Liabilities DeferredTaxAssetsTaxEffectTaxRegulatoryLiabilities	9700000	USD
CY2016Q4	es	Deferred Tax Assets Tax Effect Tax Regulatory Liabilities DeferredTaxAssetsTaxEffectTaxRegulatoryLiabilities	11800000	USD
CY2015Q4	es	Deferred Tax Liabilities Goodwill Regulatory Asset DeferredTaxLiabilitiesGoodwillRegulatoryAsset	194900000	USD
CY2016Q4	es	Deferred Tax Liabilities Goodwill Regulatory Asset DeferredTaxLiabilitiesGoodwillRegulatoryAsset	186700000	USD
CY2015Q4	es	Deferred Tax Liabilities Regulatory Assets Derivative Assets DeferredTaxLiabilitiesRegulatoryAssetsDerivativeAssets	17700000	USD
CY2016Q4	es	Deferred Tax Liabilities Regulatory Assets Derivative Assets DeferredTaxLiabilitiesRegulatoryAssetsDerivativeAssets	29500000	USD
CY2015Q4	es	Deferred Tax Liabilities Regulatory Assets Other Regulatory Deferrals DeferredTaxLiabilitiesRegulatoryAssetsOtherRegulatoryDeferrals	1289100000	USD
CY2016Q4	es	Deferred Tax Liabilities Regulatory Assets Other Regulatory Deferrals DeferredTaxLiabilitiesRegulatoryAssetsOtherRegulatoryDeferrals	1321800000	USD
CY2015Q4	es	Deferred Tax Liabilities Regulatory Assets Tax Effect Tax Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssetsTaxEffectTaxRegulatoryAssets	249300000	USD
CY2016Q4	es	Deferred Tax Liabilities Regulatory Assets Tax Effect Tax Regulatory Assets DeferredTaxLiabilitiesRegulatoryAssetsTaxEffectTaxRegulatoryAssets	252600000	USD
CY2015Q4	es	Deferred Tax Liabilities Resulting From Property Tax Accruals And Other DeferredTaxLiabilitiesResultingFromPropertyTaxAccrualsAndOther	76700000	USD
CY2016Q4	es	Deferred Tax Liabilities Resulting From Property Tax Accruals And Other DeferredTaxLiabilitiesResultingFromPropertyTaxAccrualsAndOther	81900000	USD
CY2016Q4	es	Derivative Assets Subject To Credit Risk With Investment Grade Counterparty DerivativeAssetsSubjectToCreditRiskWithInvestmentGradeCounterparty	76200000	USD
CY2014	es	Derivative Instruments Gain Loss Recognized In Regulatory Asset Liability DerivativeInstrumentsGainLossRecognizedInRegulatoryAssetLiability	134400000	USD
CY2015	es	Derivative Instruments Gain Loss Recognized In Regulatory Asset Liability DerivativeInstrumentsGainLossRecognizedInRegulatoryAssetLiability	-60200000	USD
CY2016	es	Derivative Instruments Gain Loss Recognized In Regulatory Asset Liability DerivativeInstrumentsGainLossRecognizedInRegulatoryAssetLiability	-125500000	USD
CY2016	es	Distribution Assets Average Useful Life DistributionAssetsAverageUsefulLife	P35Y1M6D
CY2015	es	Espp Discounted Purchase Price First Six Months ESPPDiscountedPurchasePriceFirstSixMonths	52.80
CY2016	es	Espp Discounted Purchase Price First Six Months ESPPDiscountedPurchasePriceFirstSixMonths	51.11
CY2015	es	Espp Discounted Purchase Price Second Six Months ESPPDiscountedPurchasePriceSecondSixMonths	47.23
CY2014	es	Effective Income Tax Rate Reconciliation Excess Stock Benefit EffectiveIncomeTaxRateReconciliationExcessStockBenefit	0	USD
CY2015	es	Effective Income Tax Rate Reconciliation Excess Stock Benefit EffectiveIncomeTaxRateReconciliationExcessStockBenefit	0	USD
CY2016	es	Effective Income Tax Rate Reconciliation Excess Stock Benefit EffectiveIncomeTaxRateReconciliationExcessStockBenefit	19100000	USD
CY2016	es	Effective Income Tax Rate Reconciliation Sharebased Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationSharebasedCompensationExcessTaxBenefitAmount	19100000	USD
CY2016	es	Effective Tax Rate Reconciliation Percent Tax Effecton Share Based Payments EffectiveTaxRateReconciliationPercentTaxEffectonShareBasedPayments	0.40
CY2015Q4	es	Employee Stock Purchase Plan Shares Remaining For Future Issuance EmployeeStockPurchasePlanSharesRemainingForFutureIssuance	743260	shares
CY2014	es	Energy Efficiency Programs EnergyEfficiencyPrograms	473127000	USD
CY2015	es	Environmental Site Quantity EnvironmentalSiteQuantity	64	site
CY2016	es	Environmental Site Quantity EnvironmentalSiteQuantity	61	site
CY2015Q2	es	Equity Return Relatedto Clean Air Project Forgone EquityReturnRelatedtoCleanAirProjectForgone	25000000	USD
CY2014	es	Fuel Costs Incurred FuelCostsIncurred	120500000	USD
CY2015	es	Fuel Costs Incurred FuelCostsIncurred	95900000	USD
CY2016	es	Fuel Costs Incurred FuelCostsIncurred	55700000	USD
CY2014	es	Fuel Power Costs FuelPowerCosts	599400000	USD
CY2015	es	Fuel Power Costs FuelPowerCosts	516700000	USD
CY2016	es	Fuel Power Costs FuelPowerCosts	372200000	USD
CY2016	es	Generation Assets Average Useful Life GenerationAssetsAverageUsefulLife	P29Y
CY2016Q4	es	Impact Of Share Based Compensation Accounting Guidance On Income Tax ImpactOfShareBasedCompensationAccountingGuidanceOnIncomeTax	19100000	USD
CY2014	es	Public Utilities Allowance For Funds Used During Construction Capitalized Total PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedTotal	19500000	USD
CY2015	es	Public Utilities Allowance For Funds Used During Construction Capitalized Total PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedTotal	26000000	USD
CY2016	es	Public Utilities Allowance For Funds Used During Construction Capitalized Total PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedTotal	37000000	USD
CY2014	es	Impactofnewaccountingstandardoncashflowstatement Impactofnewaccountingstandardoncashflowstatement	16500000	USD
CY2015	es	Impactofnewaccountingstandardoncashflowstatement Impactofnewaccountingstandardoncashflowstatement	9700000	USD
CY2016	es	Impactofnewaccountingstandardoncashflowstatement Impactofnewaccountingstandardoncashflowstatement	26600000	USD
CY2015Q4	es	Interest Included In Payment To Settle Spent Nuclear Fuel Obligation InterestIncludedInPaymentToSettleSpentNuclearFuelObligation	130700000	USD
CY2016Q4	es	Interest Included In Payment To Settle Spent Nuclear Fuel Obligation InterestIncludedInPaymentToSettleSpentNuclearFuelObligation	131200000	USD
CY2016Q4	es	Longtermdebtmaturitiesrepaymentsofprincipaltotal Longtermdebtmaturitiesrepaymentsofprincipaltotal	9336600000	USD
CY2014	es	Natural Gas Procurement Costs Incurred NaturalGasProcurementCostsIncurred	482500000	USD
CY2015	es	Natural Gas Procurement Costs Incurred NaturalGasProcurementCostsIncurred	428600000	USD
CY2016	es	Natural Gas Procurement Costs Incurred NaturalGasProcurementCostsIncurred	323900000	USD
CY2016	es	Numberof Companies That Transmit Electricity Imported From Hydro Quebec System NumberofCompaniesThatTransmitElectricityImportedFromHydroQuebecSystem	2	companies
CY2016	es	Numberof Electricand Natural Gas Customers NumberofElectricandNaturalGasCustomers	3700000	customer
CY2016	es	Numberof Environmental Sites Designatedas Superfund Sites NumberofEnvironmentalSitesDesignatedasSuperfundSites	9	site
CY2016	es	Numberof Nuclear Generation Companies NumberofNuclearGenerationCompanies	3	companies
CY2016	es	Other Assets Average Useful Life OtherAssetsAverageUsefulLife	P11Y
CY2014	es	Otherchangesinshareholdersequity Otherchangesinshareholdersequity	9316000	USD
CY2015	es	Otherchangesinshareholdersequity Otherchangesinshareholdersequity	3653000	USD
CY2016	es	Otherchangesinshareholdersequity Otherchangesinshareholdersequity	-449000	USD
CY2014	es	Payments Refunds Relatedto Spent Nuclear Fuel PaymentsRefundsRelatedtoSpentNuclearFuel	132138000	USD
CY2015	es	Payments Refunds Relatedto Spent Nuclear Fuel PaymentsRefundsRelatedtoSpentNuclearFuel	-297253000	USD
CY2016	es	Payments Refunds Relatedto Spent Nuclear Fuel PaymentsRefundsRelatedtoSpentNuclearFuel	59804000	USD
CY2014	es	Peaker Cfd Expense Incurred PeakerCfdExpenseIncurred	18100000	USD
CY2015	es	Peaker Cfd Expense Incurred PeakerCfdExpenseIncurred	42700000	USD
CY2016	es	Peaker Cfd Expense Incurred PeakerCfdExpenseIncurred	47700000	USD
CY2016	es	Pension Serp And Pbop Gain Loss To Be Reclassified Within Twelve Months PensionSerpAndPbopGainLossToBeReclassifiedWithinTwelveMonths	-6600000	USD
CY2016	es	Percentageof Closing Market Pricefor Espp Purchased By Employeesatthe Endof Successive Six Month Offering Period PercentageofClosingMarketPriceforESPPPurchasedByEmployeesattheEndofSuccessiveSixMonthOfferingPeriod	0.95
CY2016	es	Percentageof Costsand Benefits Borne Under Unrecorded Unconditional Purchase Obligationby United Illuminated Company PercentageofCostsandBenefitsBorneUnderUnrecordedUnconditionalPurchaseObligationbyUnitedIlluminatedCompany	0.2
CY2016	es	Percentageof Costsor Benefits Borne Under Capacity Related Contractsby United Illuminated Company PercentageofCostsorBenefitsBorneUnderCapacityRelatedContractsbyUnitedIlluminatedCompany	0.2
CY2015Q4	es	Property Plant And Equipment Net Excluding Construction Work In Progress PropertyPlantAndEquipmentNetExcludingConstructionWorkInProgress	18829900000	USD
CY2016Q4	es	Property Plant And Equipment Net Excluding Construction Work In Progress PropertyPlantAndEquipmentNetExcludingConstructionWorkInProgress	20338100000	USD
CY2015Q4	es	Public Utilities Property Plant And Equipment Distribution Natural Gas PublicUtilitiesPropertyPlantAndEquipmentDistributionNaturalGas	2727200000	USD
CY2016Q4	es	Public Utilities Property Plant And Equipment Distribution Natural Gas PublicUtilitiesPropertyPlantAndEquipmentDistributionNaturalGas	3010400000	USD
CY2015Q4	es	Public Utilities Property Plant And Equipment Electric And Natural Gas Utility Total PublicUtilitiesPropertyPlantAndEquipmentElectricAndNaturalGasUtilityTotal	24668000000	USD
CY2016Q4	es	Public Utilities Property Plant And Equipment Electric And Natural Gas Utility Total PublicUtilitiesPropertyPlantAndEquipmentElectricAndNaturalGasUtilityTotal	26468900000	USD
CY2015Q4	es	Public Utilities Property Plantand Equipment Accumulated Depreciation Electricand Natural Gas PublicUtilitiesPropertyPlantandEquipmentAccumulatedDepreciationElectricandNaturalGas	6141100000	USD
CY2016Q4	es	Public Utilities Property Plantand Equipment Accumulated Depreciation Electricand Natural Gas PublicUtilitiesPropertyPlantandEquipmentAccumulatedDepreciationElectricandNaturalGas	6480400000	USD
CY2015Q4	es	Public Utilities Property Plantand Equipment Accumulated Depreciation Other PublicUtilitiesPropertyPlantandEquipmentAccumulatedDepreciationOther	255600000	USD
CY2016Q4	es	Public Utilities Property Plantand Equipment Accumulated Depreciation Other PublicUtilitiesPropertyPlantandEquipmentAccumulatedDepreciationOther	242000000	USD
CY2015Q4	es	Purchase Accounting Deferred Tax Asset PurchaseAccountingDeferredTaxAsset	119300000	USD
CY2016Q4	es	Purchase Accounting Deferred Tax Asset PurchaseAccountingDeferredTaxAsset	112200000	USD
CY2014	es	Renewable Energy Costs Incurred RenewableEnergyCostsIncurred	114400000	USD
CY2015	es	Renewable Energy Costs Incurred RenewableEnergyCostsIncurred	144300000	USD
CY2016	es	Renewable Energy Costs Incurred RenewableEnergyCostsIncurred	210900000	USD
CY2016	es	Supply And Stranded Costs Obligations Incurred SupplyAndStrandedCostsObligationsIncurred	152500000	USD
CY2014	es	Supply And Stranded Costs Obligations Incurred SupplyAndStrandedCostsObligationsIncurred	99200000	USD
CY2015	es	Supply And Stranded Costs Obligations Incurred SupplyAndStrandedCostsObligationsIncurred	147600000	USD
CY2016	es	Transmission Assets Average Useful Life TransmissionAssetsAverageUsefulLife	P41Y6M
CY2014	es	Transmission Support Commitment Costs Incurred TransmissionSupportCommitmentCostsIncurred	25000000	USD
CY2015	es	Transmission Support Commitment Costs Incurred TransmissionSupportCommitmentCostsIncurred	25300000	USD
CY2016	es	Transmission Support Commitment Costs Incurred TransmissionSupportCommitmentCostsIncurred	15900000	USD
CY2015Q4	es	Uncollectible Hardship Accounts Receivable Reserve UncollectibleHardshipAccountsReceivableReserve	118500000	USD
CY2016Q4	es	Uncollectible Hardship Accounts Receivable Reserve UncollectibleHardshipAccountsReceivableReserve	119900000	USD
CY2016	es	Unrecorded Unconditional Purchase Obligation Amountof Capacity Contractsfor Differences Between Cl Pand United Illuminated Company UnrecordedUnconditionalPurchaseObligationAmountofCapacityContractsforDifferencesBetweenCLPandUnitedIlluminatedCompany	787	MW
CY2016	es	Unrecorded Unconditional Purchase Obligation Numberof Capacity Contractsfor Differences Between Cl Pand United Illuminated Company UnrecordedUnconditionalPurchaseObligationNumberofCapacityContractsforDifferencesBetweenCLPandUnitedIlluminatedCompany	4	contract
CY2016	es	Unrecorded Unconditional Purchase Obligation Numberof Demand Response Projects Between Cl Pand United Illuminated Company UnrecordedUnconditionalPurchaseObligationNumberofDemandResponseProjectsBetweenCLPandUnitedIlluminatedCompany	1	project
CY2016	es	Unrecorded Unconditional Purchase Obligation Numberof Generation Projects Between Cl Pand United Illuminated Company UnrecordedUnconditionalPurchaseObligationNumberofGenerationProjectsBetweenCLPandUnitedIlluminatedCompany	3	project
CY2015Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	813646000	USD
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	884521000	USD
CY2015Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	775480000	USD
CY2016Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	847301000	USD
CY2014Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	43300000	USD
CY2015Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	51100000	USD
CY2016Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	65800000	USD
CY2015	us-gaap	Accrual For Environmental Loss Contingencies Payments AccrualForEnvironmentalLossContingenciesPayments	5700000	USD
CY2016	us-gaap	Accrual For Environmental Loss Contingencies Payments AccrualForEnvironmentalLossContingenciesPayments	5900000	USD
CY2015	us-gaap	Accrual For Environmental Loss Contingencies Provision For New Losses AccrualForEnvironmentalLossContingenciesProvisionForNewLosses	13500000	USD
CY2016	us-gaap	Accrual For Environmental Loss Contingencies Provision For New Losses AccrualForEnvironmentalLossContingenciesProvisionForNewLosses	20600000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-66844000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-65282000	USD
CY2015Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	5800000	USD
CY2015Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	6262368000	USD
CY2016Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	6250224000	USD
CY2014	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	24600000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	23100000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	23600000	USD
CY2015Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	190700000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	200600000	USD
CY2014	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	10704000	USD
CY2015	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	22339000	USD
CY2016	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	71696000	USD
CY2015Q4	us-gaap	Amount Of Regulatory Costs Not Yet Approved AmountOfRegulatoryCostsNotYetApproved	75300000	USD
CY2016Q4	us-gaap	Amount Of Regulatory Costs Not Yet Approved AmountOfRegulatoryCostsNotYetApproved	86300000	USD
CY2014	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3643	shares
CY2015	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1474	shares
CY2016	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2014Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	426300000	USD
CY2015Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	430100000	USD
CY2016Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	426400000	USD
CY2015	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	26500000	USD
CY2016	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	22900000	USD
CY2015	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	18200000	USD
CY2015	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	6600000	USD
CY2016	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	1300000	USD
CY2016Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	2300000	USD
CY2016	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	19000000	USD
CY2015	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-11100000	USD
CY2016	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-8900000	USD
CY2015Q4	us-gaap	Assets Assets	30580300000	USD
CY2015Q4	us-gaap	Assets Assets	30580309000	USD
CY2016Q4	us-gaap	Assets Assets	32053200000	USD
CY2016Q4	us-gaap	Assets Assets	32053173000	USD
CY2015Q4	us-gaap	Assets Current AssetsCurrent	2618786000	USD
CY2016Q4	us-gaap	Assets Current AssetsCurrent	2477672000	USD
CY2015Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	8069082000	USD
CY2016Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	8224991000	USD
CY2016Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	296200000	USD
CY2016Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	59700000	USD
CY2016Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	58300000	USD
CY2016Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	45400000	USD
CY2016Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	45800000	USD
CY2016Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	130600000	USD
CY2016Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	130800000	USD
CY2016Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	60500000	USD
CY2016Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	60300000	USD
CY2016Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	295200000	USD
CY2014	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	181900000	USD
CY2015	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	216600000	USD
CY2016	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	301500000	USD
CY2016Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	11800000	USD
CY2016Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	2300000	USD
CY2016Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	1700000	USD
CY2016Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	2200000	USD
CY2016Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	2200000	USD
CY2016Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	1100000	USD
CY2016Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	2900000	USD
CY2016Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	8900000	USD
CY2015Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	19313357000	USD
CY2016Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	19696656000	USD
CY2013Q4	us-gaap	Cash Cash	43364000	USD
CY2014Q4	us-gaap	Cash Cash	38703000	USD
CY2015Q4	us-gaap	Cash Cash	23947000	USD
CY2016Q4	us-gaap	Cash Cash	30251000	USD
CY2014	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-4661000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-14756000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	6304000	USD
CY2016	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	-3400000	USD
CY2015Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	53000000	USD
CY2014	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	24500000	USD
CY2015	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.67
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	45700000	USD
CY2016Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2014	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.57
CY2016	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.78
CY2014Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2015Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2015Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	380000000	shares
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	380000000	shares
CY2015Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	333862615	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	333878402	shares
CY2015Q4	us-gaap	Common Stock Value CommonStockValue	1669313000	USD
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	1669392000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	791568000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	885650000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	943864000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	7519000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	7519000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	7519000	USD
CY2014	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	3021550000	USD
CY2015	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	3086905000	USD
CY2016	us-gaap	Cost Of Purchased Power CostOfPurchasedPower	2500828000	USD
CY2015Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	202647000	USD
CY2016Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	168490000	USD
CY2014	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	4400000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	6200000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	38900000	USD
CY2014	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	28900000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	51900000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	91900000	USD
CY2014Q4	us-gaap	Deferred Compensation Cashbased Arrangements Liability Classified Noncurrent DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent	57500000	USD
CY2015Q4	us-gaap	Deferred Compensation Cashbased Arrangements Liability Classified Noncurrent DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent	55200000	USD
CY2016Q4	us-gaap	Deferred Compensation Cashbased Arrangements Liability Classified Noncurrent DeferredCompensationCashbasedArrangementsLiabilityClassifiedNoncurrent	54200000	USD
CY2014	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	406800000	USD
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	436100000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	427900000	USD
CY2014	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	443300000	USD
CY2014	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	443259000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	491700000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	491736000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	466463000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	466500000	USD
CY2014	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	36500000	USD
CY2014	us-gaap	Depreciation Depreciation	614657000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	55600000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	38600000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	172700000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	192600000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1445700000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1495200000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1442000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1490100000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	5400000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	0	USD
CY2015Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	197100000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	170500000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	243500000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	290900000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	637500000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	640600000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	60500000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	76600000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	3700000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	5100000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	6589700000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	7097300000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	5147678000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	5607207000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	159400000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	223600000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	4602600000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	5001200000	USD
CY2014	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	29700000	USD
CY2015	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	30400000	USD
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	31800000	USD
CY2015	us-gaap	Depreciation Depreciation	665856000	USD
CY2016	us-gaap	Depreciation Depreciation	715466000	USD
CY2014	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	625400000	USD
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	688200000	USD
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	787100000	USD
CY2015Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	337102000	USD
CY2016Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	413676000	USD
CY2015Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	5800000	USD
CY2014	us-gaap	Dividends Common Stock DividendsCommonStock	496524000	USD
CY2015	us-gaap	Dividends Common Stock DividendsCommonStock	529791000	USD
CY2016	us-gaap	Dividends Common Stock DividendsCommonStock	564486000	USD
CY2014	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7519000	USD
CY2015	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7519000	USD
CY2016	us-gaap	Dividends Preferred Stock DividendsPreferredStock	7519000	USD
CY2014	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.59
CY2015Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.80
CY2015Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.65
CY2015Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.74
CY2015Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.77
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.77
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.64
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.83
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.72
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.97
CY2014	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.58
CY2015Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.80
CY2015Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.65
CY2015Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.74
CY2015Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.57
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.76
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.77
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.64
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.83
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.72
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.96
CY2014	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.362
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.379
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.369
CY2014	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2016	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	1300000	USD
CY2016Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	13900000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y9M4D
CY2014	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	10300000	USD
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	9400000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	9600000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit Realized From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	500000	USD
CY2015Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	336476000	USD
CY2016Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	328721000	USD
CY2015Q4	us-gaap	Equity Method Investments EquityMethodInvestments	48000000	USD
CY2016Q4	us-gaap	Equity Method Investments EquityMethodInvestments	236900000	USD
CY2014	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	9500000	USD
CY2015	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	9500000	USD
CY2014	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	148200000	USD
CY2015	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	147200000	USD
CY2016	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	162700000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-15797000	USD
CY2015Q4	us-gaap	Goodwill Goodwill	3500000000	USD
CY2015Q4	us-gaap	Goodwill Goodwill	3519401000	USD
CY2016Q4	us-gaap	Goodwill Goodwill	3500000000	USD
CY2016Q4	us-gaap	Goodwill Goodwill	3519401000	USD
CY2016Q4	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2015	us-gaap	Goodwill Other Changes GoodwillOtherChanges	0	USD
CY2016	us-gaap	Goodwill Other Changes GoodwillOtherChanges	0	USD
CY2014	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1295362000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1425971000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1504800000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	1504818000	USD
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	468300000	USD
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	468297000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	539967000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	540000000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	555000000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	554997000	USD
CY2014	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	8000000	USD
CY2015	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	8100000	USD
CY2016	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	8400000	USD
CY2014	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-2900000	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	4700000	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	3300000	USD
CY2014	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	453400000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	499100000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	526700000	USD
CY2014	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-5600000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-4600000	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-3400000	USD
CY2014	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-3700000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-4800000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	6600000	USD
CY2014	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	42500000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	61100000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	56200000	USD
CY2014	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3900000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3600000	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3400000	USD
CY2014	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	3500000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	3800000	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	3500000	USD
CY2014	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	334200000	USD
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	10300000	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-135500000	USD
CY2015Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	305359000	USD
CY2016Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	80471000	USD
CY2014	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	144743000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-91618000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-14126000	USD
CY2016	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-300000000	USD
CY2014	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	323224000	USD
CY2015	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-30282000	USD
CY2016	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-234543000	USD
CY2014	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	41310000	USD
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-34112000	USD
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-7755000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-44031000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-9112000	USD
CY2014	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	122139000	USD
CY2014	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-64842000	USD
CY2016Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	745000000	USD
CY2016Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	871300000	USD
CY2016Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	295000000	USD
CY2016Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	800000000	USD
CY2016Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	960000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	210643000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-17940000	USD
CY2014	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1591795000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1659150000	USD
CY2015	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	39797000	USD
CY2016	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	142699000	USD
CY2014	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-6853000	USD
CY2015	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	163287000	USD
CY2016	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-13340000	USD
CY2014	us-gaap	Interest Expense InterestExpense	362106000	USD
CY2014	us-gaap	Interest Expense InterestExpense	362100000	USD
CY2015	us-gaap	Interest Expense InterestExpense	372420000	USD
CY2015	us-gaap	Interest Expense InterestExpense	372400000	USD
CY2016	us-gaap	Interest Expense InterestExpense	400961000	USD
CY2016	us-gaap	Interest Expense InterestExpense	401000000	USD
CY2014	us-gaap	Interest Paid Net InterestPaidNet	349600000	USD
CY2015	us-gaap	Interest Paid Net InterestPaidNet	365900000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	398100000	USD
CY2014	us-gaap	Investment Income Interest InvestmentIncomeInterest	6000000	USD
CY2015	us-gaap	Investment Income Interest InvestmentIncomeInterest	6700000	USD
CY2016	us-gaap	Investment Income Interest InvestmentIncomeInterest	11000000	USD
CY2015Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	545700000	USD
CY2016Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	569200000	USD
CY2014	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	14300000	USD
CY2015	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	12100000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	12100000	USD
CY2015Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	30580309000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	32053173000	USD
CY2015Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2989790000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	3638605000	USD
CY2015Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	8277162000	USD
CY2016Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	8717912000	USD
CY2015Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	228883000	USD
CY2016Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	773883000	USD
CY2016Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	5665300000	USD
CY2015Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	8805574000	USD
CY2016Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	8829354000	USD
CY2015Q4	us-gaap	Marketable Securities Noncurrent MarketableSecuritiesNoncurrent	516478000	USD
CY2016Q4	us-gaap	Marketable Securities Noncurrent MarketableSecuritiesNoncurrent	544642000	USD
CY2015Q4	us-gaap	Marketable Securities Restricted Noncurrent MarketableSecuritiesRestrictedNoncurrent	436900000	USD
CY2016Q4	us-gaap	Marketable Securities Restricted Noncurrent MarketableSecuritiesRestrictedNoncurrent	466700000	USD
CY2014	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1651976000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2150808000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1433751000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2175052000	USD
CY2014	us-gaap	Net Income Loss NetIncomeLoss	827065000	USD
CY2015Q1	us-gaap	Net Income Loss NetIncomeLoss	255100000	USD
CY2015Q2	us-gaap	Net Income Loss NetIncomeLoss	209400000	USD
CY2015Q3	us-gaap	Net Income Loss NetIncomeLoss	237800000	USD
CY2015Q4	us-gaap	Net Income Loss NetIncomeLoss	183700000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	886000000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	886004000	USD
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	246000000	USD
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	205500000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	267200000	USD
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	231100000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	949821000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	949800000	USD
CY2014	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7500000	USD
CY2014	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7519000	USD
CY2015	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7519000	USD
CY2015	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7500000	USD
CY2016	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7500000	USD
CY2016	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	7519000	USD
CY2014	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	819546000	USD
CY2014	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	819500000	USD
CY2015Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	253300000	USD
CY2015Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	207500000	USD
CY2015Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	235900000	USD
CY2015Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	181800000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	878485000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	878500000	USD
CY2016Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	244200000	USD
CY2016Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	203600000	USD
CY2016Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	265300000	USD
CY2016Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	229200000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	942300000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	942302000	USD
CY2014	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	24619000	USD
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	34227000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	45920000	USD
CY2015Q4	us-gaap	Notes Payable NotesPayable	1160953000	USD
CY2016Q4	us-gaap	Notes Payable NotesPayable	1148500000	USD
CY2015	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	900000	USD
CY2014	us-gaap	Operating Expenses OperatingExpenses	6109007000	USD
CY2014	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	18600000	USD
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	27500000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	34900000	USD
CY2014	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-24159000	USD
CY2015	us-gaap	Operating Expenses OperatingExpenses	6190663000	USD
CY2016	us-gaap	Operating Expenses OperatingExpenses	5779270000	USD
CY2014	us-gaap	Operating Income Loss OperatingIncomeLoss	1632849000	USD
CY2014	us-gaap	Operating Income Loss OperatingIncomeLoss	1632800000	USD
CY2015Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	497500000	USD
CY2015Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	412000000	USD
CY2015Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	469200000	USD
CY2015Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	385500000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	1764200000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	1764164000	USD
CY2016Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	488500000	USD
CY2016Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	423400000	USD
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	509900000	USD
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	438100000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	1859900000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	1859859000	USD
CY2016Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	56800000	USD
CY2016Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	14100000	USD
CY2016Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	6000000	USD
CY2016Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	7000000	USD
CY2016Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	8700000	USD
CY2016Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	10600000	USD
CY2016Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	10400000	USD
CY2015Q4	us-gaap	Other Assets Current OtherAssetsCurrent	129034000	USD
CY2016Q4	us-gaap	Other Assets Current OtherAssetsCurrent	134813000	USD
CY2015Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	295243000	USD
CY2016Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	522260000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	315000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-2588000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	2294000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	2037000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	2079000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	2137000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-27978000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7165000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1562000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7200000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	30330000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-7674000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	2869000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	22300000	USD
CY2015Q1	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	-2000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBeforeReclassificationAdjustmentsTax	4000000	USD
CY2015Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	678549000	USD
CY2016Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	684914000	USD
CY2015Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	871499000	USD
CY2016Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	853260000	USD
CY2014	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-56026000	USD
CY2015	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	82219000	USD
CY2016	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	77294000	USD
CY2015	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-6291000	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-36951000	USD
CY2014	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	475227000	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	529791000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	564486000	USD
CY2014	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	7519000	USD
CY2015	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	7519000	USD
CY2016	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	7519000	USD
CY2014	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	9779000	USD
CY2015	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	23353000	USD
CY2016	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	188958000	USD
CY2014	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	491220000	USD
CY2015	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	717114000	USD
CY2016	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	681272000	USD
CY2014	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1603744000	USD
CY2014	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1603700000	USD
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1724139000	USD
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1724100000	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1976867000	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1976900000	USD
CY2014	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	211649000	USD
CY2015	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	162452000	USD
CY2016	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	158741000	USD
CY2014	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	99056000	USD
CY2015	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	96017000	USD
CY2016	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	39912000	USD
CY2015Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	1407288000	USD
CY2016Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	1141514000	USD
CY2015Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	155600000	USD
CY2016Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	155600000	USD
CY2016	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	275000000	USD
CY2014	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	725000000	USD
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1225000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	800000000	USD
CY2014	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-15620000	USD
CY2015	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-18225000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-33482000	USD
CY2014	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	285075000	USD
CY2015	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-242122000	USD
CY2016	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-12453000	USD
CY2014	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	488789000	USD
CY2015	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	799165000	USD
CY2016	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	659338000	USD
CY2014	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	13700000	USD
CY2015	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	18800000	USD
CY2016	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	26200000	USD
CY2014	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	5800000	USD
CY2015	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	7200000	USD
CY2016	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	10800000	USD
CY2014	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.034
CY2015	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.039
CY2016	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.044
CY2015Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	6396700000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	6722400000	USD
CY2015Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	1062500000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	1012400000	USD
CY2014	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.030
CY2015	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.029
CY2016	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.030
CY2015Q4	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	13054800000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Distribution PublicUtilitiesPropertyPlantAndEquipmentDistribution	13716900000	USD
CY2015Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	1194100000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Generation Or Processing PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing	1224200000	USD
CY2015Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	19892441000	USD
CY2015Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	19892400000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	21350510000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	21350500000	USD
CY2015Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	558600000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	591600000	USD
CY2015Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	25226600000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	27060500000	USD
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CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Transmission PublicUtilitiesPropertyPlantAndEquipmentTransmission	8517400000	USD
CY2016Q4	us-gaap	Ratio Of Indebtedness To Net Capital1 RatioOfIndebtednessToNetCapital1	0.65
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CY2015	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-6300000	USD
CY2015Q4	us-gaap	Redeemable Noncontrolling Interest Equity Preferred Carrying Amount RedeemableNoncontrollingInterestEquityPreferredCarryingAmount	155568000	USD
CY2016Q4	us-gaap	Redeemable Noncontrolling Interest Equity Preferred Carrying Amount RedeemableNoncontrollingInterestEquityPreferredCarryingAmount	155568000	USD
CY2015Q4	us-gaap	Regulatory Assets RegulatoryAssets	4583800000	USD
CY2016Q4	us-gaap	Regulatory Assets RegulatoryAssets	4526300000	USD
CY2015Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	845800000	USD
CY2015Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	845843000	USD
CY2016Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	887600000	USD
CY2016Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	887625000	USD
CY2015Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3738000000	USD
CY2015Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3737960000	USD
CY2016Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3638700000	USD
CY2016Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3638688000	USD
CY2015Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	621400000	USD
CY2016Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	849100000	USD
CY2016Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	146787000	USD
CY2015Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	107800000	USD
CY2015Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	107759000	USD
CY2016Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	146800000	USD
CY2015Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	513600000	USD
CY2015Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	513595000	USD
CY2016Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	702255000	USD
CY2016Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	702300000	USD
CY2014	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	576551000	USD
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	216700000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	200000000	USD
CY2015Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2797355000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	3175171000	USD
CY2016Q4	us-gaap	Retained Earnings Unappropriated RetainedEarningsUnappropriated	3200000000	USD
CY2014	us-gaap	Revenues Revenues	7741900000	USD
CY2014	us-gaap	Revenues Revenues	7741856000	USD
CY2015Q1	us-gaap	Revenues Revenues	2513400000	USD
CY2015Q2	us-gaap	Revenues Revenues	1817100000	USD
CY2015Q3	us-gaap	Revenues Revenues	1933100000	USD
CY2015Q4	us-gaap	Revenues Revenues	1691200000	USD
CY2015	us-gaap	Revenues Revenues	7954827000	USD
CY2015	us-gaap	Revenues Revenues	7954800000	USD
CY2016Q1	us-gaap	Revenues Revenues	2055600000	USD
CY2016Q2	us-gaap	Revenues Revenues	1767200000	USD
CY2016Q3	us-gaap	Revenues Revenues	2039700000	USD
CY2016Q4	us-gaap	Revenues Revenues	1776600000	USD
CY2016	us-gaap	Revenues Revenues	7639100000	USD
CY2016	us-gaap	Revenues Revenues	7639129000	USD
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	322158	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	48.96
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	8000000	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	3005010	shares
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2692350	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1300000	USD
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	4200000	USD
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	3700000	USD
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	171872	shares
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	124640	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	26.47
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	25.84
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	28.12
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P2Y
CY2015	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	33715	shares
CY2016	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	16014	shares
CY2016	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	47232	shares
CY2014	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	6609000	USD
CY2015	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	9468000	USD
CY2016	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	-5560000	USD
CY2014	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-9569000	USD
CY2015	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-6140000	USD
CY2016	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-6056000	USD
CY2014	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	63887000	USD
CY2015	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	12560000	USD
CY2016	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	-7794000	USD
CY2013Q4	us-gaap	Stockholders Equity StockholdersEquity	9611528000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	9976815000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	10352215000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	10711734000	USD
CY2014	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	561380000	USD
CY2015	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	590573000	USD
CY2016	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	634072000	USD
CY2015	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	26.02
CY2016	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	24.26
CY2015Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	16671366	shares
CY2016Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	16992594	shares
CY2015	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	532521	shares
CY2016	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	321228	shares
CY2015Q4	us-gaap	Treasury Stock Value TreasuryStockValue	309977000	USD
CY2016Q4	us-gaap	Treasury Stock Value TreasuryStockValue	317771000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	38200000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	46200000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	48000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	48400000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	9300000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	9900000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	9900000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	300000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	100000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	200000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	2000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	1800000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	400000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	100000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	-200000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1600000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	8200000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	9700000	USD
CY2016Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	433900000	USD
CY2016Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	667800000	USD
CY2016Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary	483200000	USD
CY2016Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	557100000	USD
CY2016Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	498400000	USD
CY2016Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	4972200000	USD
CY2016Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Due After Five Years UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	2331800000	USD
CY2014	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1427589000	USD
CY2015	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1329289000	USD
CY2016	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1323549000	USD
CY2014	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	5483700000	USD
CY2015	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	5502400000	USD
CY2016	us-gaap	Utilities Operating Expense Other UtilitiesOperatingExpenseOther	4992100000	USD
CY2014	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1280666	shares
CY2015	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1095806	shares
CY2016	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	804059	shares
CY2014	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	317417414	shares
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	318432687	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	318454239	shares
CY2014	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	316136748	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	317336881	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	317650180	shares
CY2016	us-gaap	Revenue Recognition Deferred Revenue RevenueRecognitionDeferredRevenue	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">Revenues</font></div><div style="line-height:120%;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-style:italic;">Regulated Companies' Retail Revenues:  </font><font style="font-family:inherit;font-size:9pt;">The Regulated companies' retail revenues are based on rates approved by their respective state regulatory commissions.  In general, rates can only be changed through formal proceedings with the state regulatory commissions.  The Regulated companies' rates are designed to recover the costs to provide service to their customers, and include a return on investment.  The Regulated companies also utilize regulatory commission-approved tracking mechanisms to recover certain costs on a fully-reconciling basis.  These tracking mechanisms require rates to be changed periodically to ensure recovery of actual costs incurred.  </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">CL&P, WMECO and NSTAR Gas each have a regulatory commission approved revenue decoupling mechanism. NSTAR Gas' decoupling mechanism was effective January 1, 2016. Distribution revenues are decoupled from customer sales volumes, where applicable, which breaks the relationship between sales volumes and revenues recognized. CL&P, WMECO and NSTAR Gas reconcile their annual base distribution rate recovery to pre-established levels of baseline distribution delivery service revenues.  Any difference between the allowed level of distribution revenue and the actual amount incurred is adjusted through rates in a subsequent period.  </font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">A significant portion of the Regulated companies' retail revenues relate to the recovery of costs incurred for the sale of electricity and natural gas purchased on behalf of customers.  These energy supply costs are recovered from customers in rates through cost tracking mechanisms.  Energy purchases are recorded in Purchased Power, Fuel and Transmission, and the sales of energy associated with these purchases are recorded in Operating Revenues on the statements of income.</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-style:italic;">Regulated Companies' Unbilled Revenues:  </font><font style="font-family:inherit;font-size:9pt;">Because customers are billed throughout the month based on pre-determined cycles rather than on a calendar month basis, an estimate of electricity or natural gas delivered to customers for which the customers have not yet been billed is calculated as of the balance sheet date.  Unbilled revenues are included in Operating Revenues on the statements of income and in Current Assets on the balance sheets.  Actual amounts billed to customers when meter readings become available may vary from the estimated amount.</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">The Regulated companies estimate unbilled sales volumes monthly by first allocating billed sales volumes to the current calendar month based on the daily load (for electric distribution companies) or the daily send-out (for natural gas distribution companies) for each billing cycle.  The billed sales volumes are then subtracted from total month load or send-out, net of delivery losses, to estimate unbilled sales volumes.  Unbilled revenues are estimated by first allocating unbilled sales volumes to the respective customer classes, then applying an estimated rate by customer class to those sales volumes.  The estimate of unbilled revenues can significantly impact the amount of revenues recorded at NSTAR Electric, PSNH and Yankee Gas because they do not have a revenue decoupling mechanism.  CL&P, WMECO and NSTAR Gas record a regulatory deferral to reflect the actual allowed amount of revenue associated with their respective decoupled distribution rate design.</font></div><div style="line-height:120%;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-style:italic;">Regulated Companies' Transmission Revenues - Wholesale Rates:</font><font style="font-family:inherit;font-size:9pt;">  The Eversource transmission owning companies have a combination of FERC-approved regional and local formula rates that work in tandem to recover all their transmission costs. These rates are part of the ISO-NE Tariff. Regional rates recover the costs of higher voltage transmission facilities that benefit the region, and are collected from all New England transmission customers, including the Eversource distribution businesses. Eversource has two sets of local rates, one for the combined transmission revenue requirements of CL&P, PSNH and WMECO, and the other for NSTAR Electric. These local rates recover the companies' total transmission revenue requirements, less revenues received from regional rates and other sources, and are collected from Eversource's distribution businesses and other transmission customers. The distribution businesses of Eversource, in turn, recover the FERC approved charges from retail customers through annual or semiannual tracking mechanisms. The transmission formula rates provide for the annual reconciliation and recovery or refund of estimated costs to actual costs.  The financial impacts of differences between actual and estimated costs are deferred for future recovery from, or refunded to, transmission customers.  See Note 11E, "Commitments and Contingencies – FERC ROE Complaints," for complaints filed at the FERC relating to Eversource's ROE.</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-style:italic;">Regulated Companies' Transmission Revenues - Retail Rates:</font><font style="font-family:inherit;font-size:9pt;">  A significant portion of the Eversource transmission segment revenue comes from ISO-NE charges to the distribution businesses of CL&P, NSTAR Electric, PSNH and WMECO, each of which recovers these costs through rates charged to their retail customers.  CL&P, NSTAR Electric, PSNH and WMECO each have a retail transmission cost tracking mechanism as part of their rates, which allows the electric distribution companies to charge their retail customers for transmission costs on a timely basis.</font></div></div>

Files In Submission

Name	View Source	Status
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a201610k-exhibit12nstarele.htm	Edgar Link	pending
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a201610k-exhibit32wmeco.htm	Edgar Link	pending
a201610kdocument.htm	Edgar Link	pending
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2015 Q4 Form 10-K Financial Statement

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2015 Q4 Form 10-K Financial Statement

#000007274117000007 Filed on February 23, 2017

Income Statement

Balance Sheet

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