$PNW
PINNACLE WEST CAPITAL CORP Stock $pnw

$pnw Overview Financials Valuation SEC Filings Company Website

2014 Form 10-K Financial Statement

#000076462215000013 Filed on February 20, 2015

Income Statement

Concept	2014	2013 Q4	2013 Q3
Revenue	$3.492B	$699.8M	$1.152B
YoY Change	1.07%	0.96%	3.87%
Cost Of Revenue	$1.180B		$351.0M
YoY Change	7.68%		15.87%
Gross Profit	$2.312B		$801.4M
YoY Change	-2.0%		-0.64%
Gross Profit Margin	66.21%		69.55%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$496.5M	$114.3M	$128.5M
YoY Change	0.85%	-5.3%	6.29%
% of Gross Profit	21.48%		16.03%
Operating Expenses	$2.614B	$617.2M	$735.4M
YoY Change	0.62%	4.29%	11.17%
Operating Profit	$811.2M	$83.90M	$415.7M
YoY Change	-4.15%	-17.17%	-7.21%
Interest Expense	$185.5M	-$38.10M	$47.35M
YoY Change	-0.82%	-6.85%	-2.19%
% of Operating Profit	22.87%	-45.41%	11.39%
Other Income/Expense, Net	$18.65M	-$2.600M	-$1.706M
YoY Change	65.63%	-64.38%	-494.91%
Pretax Income	$644.4M	$42.00M	$366.6M
YoY Change	-3.9%	-20.9%	-8.34%
Income Tax	$220.7M	$9.167M	$131.9M
% Of Pretax Income	34.25%	21.83%	35.98%
Net Earnings	$423.7M	$24.30M	$234.7M
YoY Change	-3.7%	7.52%	-7.18%
Net Earnings / Revenue	12.13%	3.47%	20.37%
Basic Earnings Per Share	$3.59	$0.22	$2.06
Diluted Earnings Per Share	$3.58	$0.22	$2.04
COMMON SHARES
Basic Shares Outstanding	110.6M shares	110.0M shares	110.0M shares
Diluted Shares Outstanding	111.2M shares		111.1M shares

Balance Sheet

Concept	2014	2013 Q4	2013 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$8.000M	$10.00M	$135.0M
YoY Change	-20.0%	-61.54%	70.89%
Cash & Equivalents	$8.000M	$9.526M	$135.5M
Short-Term Investments
Other Short-Term Assets	$412.0M	$39.90M	$36.81M
YoY Change	20.47%	7.53%	31.16%
Inventory	$256.0M	$260.0M	$258.0M
Prepaid Expenses
Receivables	$295.0M	$297.0M	$424.0M
Other Receivables	$3.000M	$135.0M	$133.0M
Total Short-Term Assets	$973.0M	$1.044B	$1.350B
YoY Change	-6.8%	3.77%	22.9%
LONG-TERM ASSETS
Property, Plant & Equipment	$11.08B	$9.900B	$9.496B
YoY Change	3.21%	5.13%	3.06%
Goodwill
YoY Change
Intangibles		$157.7M	$160.1M
YoY Change		-2.75%	4.89%
Long-Term Investments
YoY Change
Other Assets	$2.121B	$60.88M	$60.22M
YoY Change	34.58%	-2.9%	-3.54%
Total Long-Term Assets	$13.32B	$12.47B	$12.47B
YoY Change	6.83%	0.74%	0.9%
TOTAL ASSETS
Total Short-Term Assets	$973.0M	$1.044B	$1.350B
Total Long-Term Assets	$13.32B	$12.47B	$12.47B
Total Assets	$14.29B	$13.51B	$13.82B
YoY Change	5.77%	0.96%	2.69%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$295.0M	$284.5M	$250.0M
YoY Change	3.51%	28.56%	8.16%
Accrued Expenses	$53.00M	$48.00M	$46.00M
YoY Change	10.42%	-2.04%	-9.8%
Deferred Revenue
YoY Change
Short-Term Debt	$147.0M	$153.1M	$0.00
YoY Change	-3.92%	66.12%
Long-Term Debt Due	$384.0M	$540.0M	$566.0M
YoY Change	-28.89%	339.02%	528.89%
Total Short-Term Liabilities	$1.559B	$1.619B	$1.447B
YoY Change	-3.71%	49.38%	52.41%
LONG-TERM LIABILITIES
Long-Term Debt	$3.007B	$2.796B	$2.820B
YoY Change	7.55%	-12.59%	-15.53%
Other Long-Term Liabilities	$2.443B	$185.7M	$178.1M
YoY Change	8.63%	0.99%	-28.23%
Total Long-Term Liabilities	$5.450B	$2.982B	$2.998B
YoY Change	8.03%	-11.85%	-16.41%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.559B	$1.619B	$1.447B
Total Long-Term Liabilities	$5.450B	$2.982B	$2.998B
Total Liabilities	$9.921B	$4.601B	$4.445B
YoY Change	6.52%	3.01%	-2.01%
SHAREHOLDERS EQUITY
Retained Earnings		$1.785B	$1.886B
YoY Change		9.92%	9.59%
Common Stock		$2.492B	$2.489B
YoY Change		1.0%	1.35%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$4.308M	$10.08M
YoY Change		2.3%	599.93%
Treasury Stock Shares		98.94K shares
Shareholders Equity	$4.367B	$4.194B	$4.276B
YoY Change
Total Liabilities & Shareholders Equity	$14.29B	$13.51B	$13.82B
YoY Change	5.77%	0.96%	2.69%

Cashflow Statement

Concept	2014	2013 Q4	2013 Q3
OPERATING ACTIVITIES
Net Income	$423.7M	$24.30M	$234.7M
YoY Change	-3.7%	7.52%	-7.18%
Depreciation, Depletion And Amortization	$496.5M	$114.3M	$128.5M
YoY Change	0.85%	-5.3%	6.29%
Cash From Operating Activities	$1.100B	$271.0M	$428.0M
YoY Change	-4.65%	12.17%	-9.11%
INVESTING ACTIVITIES
Capital Expenditures	-$910.6M	-$434.8M	-$204.9M
YoY Change	-10.4%	98.63%	-16.67%
Acquisitions
YoY Change
Other Investing Activities	-$347.0K	-$2.700M	$4.900M
YoY Change	-116.85%	170.0%	-34.67%
Cash From Investing Activities	-$922.7M	-$437.4M	-$200.1M
YoY Change	-8.59%	98.91%	-16.07%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$15.29M
YoY Change	-11.73%
Debt Paid & Issued, Net	$652.6M
YoY Change	431.29%
Cash From Financing Activities	-$178.9M	40.50M	-120.3M
YoY Change	11.4%	-154.0%	-26.74%
NET CHANGE
Cash From Operating Activities	$1.100B	271.0M	428.0M
Cash From Investing Activities	-$922.7M	-437.4M	-200.1M
Cash From Financing Activities	-$178.9M	40.50M	-120.3M
Net Change In Cash	-$1.922M	-125.9M	107.6M
YoY Change	-88.47%	136.21%	57.54%
FREE CASH FLOW
Cash From Operating Activities	$1.100B	$271.0M	$428.0M
Capital Expenditures	-$910.6M	-$434.8M	-$204.9M
Free Cash Flow	$2.010B	$705.8M	$632.9M
YoY Change	-7.35%	53.27%	-11.7%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2014	dei	Amendment Flag AmendmentFlag	false
CY2014	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2014	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2014	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2014
CY2014	dei	Document Period End Date DocumentPeriodEndDate	2014-12-31
CY2014	dei	Document Type DocumentType	10-K
CY2014	dei	Entity Central Index Key EntityCentralIndexKey	0000764622
CY2015Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	110575187	shares
CY2014	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2014	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2014Q2	dei	Entity Public Float EntityPublicFloat	6356930539	USD
CY2014	dei	Entity Registrant Name EntityRegistrantName	PINNACLE WEST CAPITAL CORP
CY2014	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2014	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2013Q4	pnw	Accumulated Amortization On Nuclear Fuel AccumulatedAmortizationOnNuclearFuel	146057000	USD
CY2014Q4	pnw	Accumulated Amortization On Nuclear Fuel AccumulatedAmortizationOnNuclearFuel	143554000	USD
CY2012	pnw	Change In Margin And Collateral Accounts Liabilities ChangeInMarginAndCollateralAccountsLiabilities	137785000	USD
CY2013	pnw	Change In Margin And Collateral Accounts Liabilities ChangeInMarginAndCollateralAccountsLiabilities	12355000	USD
CY2014	pnw	Change In Margin And Collateral Accounts Liabilities ChangeInMarginAndCollateralAccountsLiabilities	-24975000	USD
CY2013Q4	pnw	Deferred Fuel And Purchased Power Regulatory Asset Current DeferredFuelAndPurchasedPowerRegulatoryAssetCurrent	20755000	USD
CY2014Q4	pnw	Deferred Fuel And Purchased Power Regulatory Asset Current DeferredFuelAndPurchasedPowerRegulatoryAssetCurrent	6926000	USD
CY2012	pnw	Deferred Income Tax Expense Benefit Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations	228602000	USD
CY2013	pnw	Deferred Income Tax Expense Benefit Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations	301838000	USD
CY2014	pnw	Deferred Income Tax Expense Benefit Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations	185269000	USD
CY2013Q4	pnw	Deferred Tax Assets Credit And Loss Carryforwards DeferredTaxAssetsCreditAndLossCarryforwards	133070000	USD
CY2014Q4	pnw	Deferred Tax Assets Credit And Loss Carryforwards DeferredTaxAssetsCreditAndLossCarryforwards	68347000	USD
CY2013Q4	pnw	Deferred Tax Assets Regulatory Liabilities Asset Retirement Obligation And Removal Costs DeferredTaxAssetsRegulatoryLiabilitiesAssetRetirementObligationAndRemovalCosts	235959000	USD
CY2014Q4	pnw	Deferred Tax Assets Regulatory Liabilities Asset Retirement Obligation And Removal Costs DeferredTaxAssetsRegulatoryLiabilitiesAssetRetirementObligationAndRemovalCosts	229772000	USD
CY2013Q4	pnw	Deferred Tax Assets Regulatory Liabilities Other DeferredTaxAssetsRegulatoryLiabilitiesOther	42609000	USD
CY2014Q4	pnw	Deferred Tax Assets Regulatory Liabilities Other DeferredTaxAssetsRegulatoryLiabilitiesOther	60409000	USD
CY2013Q4	pnw	Deferred Tax Assets Regulatory Liabilities Other Postretirement Benefits DeferredTaxAssetsRegulatoryLiabilitiesOtherPostretirementBenefits	0	USD
CY2014Q4	pnw	Deferred Tax Assets Regulatory Liabilities Other Postretirement Benefits DeferredTaxAssetsRegulatoryLiabilitiesOtherPostretirementBenefits	90496000	USD
CY2013Q4	pnw	Deferred Tax Assets Regulatory Liabilities Unamortized Investment Tax Credits DeferredTaxAssetsRegulatoryLiabilitiesUnamortizedInvestmentTaxCredits	82116000	USD
CY2014Q4	pnw	Deferred Tax Assets Regulatory Liabilities Unamortized Investment Tax Credits DeferredTaxAssetsRegulatoryLiabilitiesUnamortizedInvestmentTaxCredits	96232000	USD
CY2013Q4	pnw	Deferred Tax Assets Renewable Energy Incentives DeferredTaxAssetsRenewableEnergyIncentives	65434000	USD
CY2014Q4	pnw	Deferred Tax Assets Renewable Energy Incentives DeferredTaxAssetsRenewableEnergyIncentives	65169000	USD
CY2013Q4	pnw	Deferred Tax Liabilities Other Postretirement Assets DeferredTaxLiabilitiesOtherPostretirementAssets	0	USD
CY2014Q4	pnw	Deferred Tax Liabilities Other Postretirement Assets DeferredTaxLiabilitiesOtherPostretirementAssets	59170000	USD
CY2013Q4	pnw	Deferred Tax Liabilities Regulatory Assets Allowance For Equity Funds Used During Construction DeferredTaxLiabilitiesRegulatoryAssetsAllowanceForEquityFundsUsedDuringConstruction	43058000	USD
CY2014Q4	pnw	Deferred Tax Liabilities Regulatory Assets Allowance For Equity Funds Used During Construction DeferredTaxLiabilitiesRegulatoryAssetsAllowanceForEquityFundsUsedDuringConstruction	48286000	USD
CY2013Q4	pnw	Deferred Tax Liabilities Regulatory Assets Deferred Fuel And Purchased Power DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPower	8282000	USD
CY2014Q4	pnw	Deferred Tax Liabilities Regulatory Assets Deferred Fuel And Purchased Power DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPower	2498000	USD
CY2013Q4	pnw	Deferred Tax Liabilities Regulatory Assets Deferred Fuel And Purchased Power Mark To Market DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPowerMarkToMarket	13343000	USD
CY2014Q4	pnw	Deferred Tax Liabilities Regulatory Assets Deferred Fuel And Purchased Power Mark To Market DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPowerMarkToMarket	38187000	USD
CY2013Q4	pnw	Deferred Tax Liabilities Regulatory Assets Other DeferredTaxLiabilitiesRegulatoryAssetsOther	85003000	USD
CY2014Q4	pnw	Deferred Tax Liabilities Regulatory Assets Other DeferredTaxLiabilitiesRegulatoryAssetsOther	99123000	USD
CY2013Q4	pnw	Deferred Tax Liabilities Regulatory Assets Pension And Other Postretirement Benefits DeferredTaxLiabilitiesRegulatoryAssetsPensionAndOtherPostretirementBenefits	129250000	USD
CY2014Q4	pnw	Deferred Tax Liabilities Regulatory Assets Pension And Other Postretirement Benefits DeferredTaxLiabilitiesRegulatoryAssetsPensionAndOtherPostretirementBenefits	191747000	USD
CY2013Q4	pnw	Deferred Tax Liabilities Regulatory Assets Retired Power Plan Costs DeferredTaxLiabilitiesRegulatoryAssetsRetiredPowerPlanCosts	8199000	USD
CY2014Q4	pnw	Deferred Tax Liabilities Regulatory Assets Retired Power Plan Costs DeferredTaxLiabilitiesRegulatoryAssetsRetiredPowerPlanCosts	57255000	USD
CY2014Q4	pnw	Defined Benefit Plan Amountof Other Postretirement Benefit Trust Assetsfor Union Employee Medical Costs DefinedBenefitPlanAmountofOtherPostretirementBenefitTrustAssetsforUnionEmployeeMedicalCosts	100000000	USD
CY2011	pnw	Defined Benefit Plan Cost Deferred DefinedBenefitPlanCostDeferred	11000000	USD
CY2012	pnw	Defined Benefit Plan Cost Deferred DefinedBenefitPlanCostDeferred	14000000	USD
CY2014	pnw	Defined Benefit Plan Mortality Assumptions Impacton Pensionand Other Postretirement Obligations DefinedBenefitPlanMortalityAssumptionsImpactonPensionandOtherPostretirementObligations	67000000	USD
CY2014	pnw	Defined Benefit Plan Partnership Funding Commitments Funded Amount DefinedBenefitPlanPartnershipFundingCommitmentsFundedAmount	30000000	USD
CY2014Q4	pnw	Defined Benefit Plan Partnership Funding Commitments Maximum Contribution Amount DefinedBenefitPlanPartnershipFundingCommitmentsMaximumContributionAmount	75000000	USD
CY2012	pnw	Defined Benefit Plan Post65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPost65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0750
CY2013	pnw	Defined Benefit Plan Post65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPost65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0750
	pnw	Defined Benefit Plan Post65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPost65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0750
CY2014Q4	pnw	Defined Benefit Plan Post65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPost65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0500
CY2013	pnw	Defined Benefit Plan Post65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Obligation DefinedBenefitPlanPost65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitObligation	0.0750
CY2014	pnw	Defined Benefit Plan Post65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Obligation DefinedBenefitPlanPost65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitObligation	0.0500
CY2012	pnw	Defined Benefit Plan Post65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPost65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P4Y
CY2013	pnw	Defined Benefit Plan Post65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPost65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P4Y
	pnw	Defined Benefit Plan Post65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPost65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P4Y
CY2014Q4	pnw	Defined Benefit Plan Post65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPost65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P0Y
CY2013	pnw	Defined Benefit Plan Post65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanPost65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitObligations	P4Y
CY2014	pnw	Defined Benefit Plan Post65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanPost65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitObligations	P0Y
CY2012	pnw	Defined Benefit Plan Pre65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPre65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0750
CY2013	pnw	Defined Benefit Plan Pre65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPre65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0750
	pnw	Defined Benefit Plan Pre65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPre65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0750
CY2014Q4	pnw	Defined Benefit Plan Pre65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPre65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0750
CY2013	pnw	Defined Benefit Plan Pre65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Obligation DefinedBenefitPlanPre65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitObligation	0.0750
CY2014	pnw	Defined Benefit Plan Pre65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Obligation DefinedBenefitPlanPre65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitObligation	0.0700
CY2012	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P4Y
CY2013	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P4Y
	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P4Y
CY2014Q4	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P4Y
CY2013	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitObligations	P4Y
CY2014	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitObligations	P4Y
CY2013	pnw	Defined Benefit Plan Ultimate Health Care Cost Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanUltimateHealthCareCostTrendRateusedinCalculatingBenefitObligations	0.0500
CY2014	pnw	Defined Benefit Plan Ultimate Health Care Cost Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanUltimateHealthCareCostTrendRateusedinCalculatingBenefitObligations	0.0500
CY2014	pnw	Fair Value Measurement Inter Level Transfers Amount FairValueMeasurementInterLevelTransfersAmount	0	USD
CY2013	pnw	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Derivative Gain Loss Deferred As Regulatory Asset Or Liability FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDerivativeGainLossDeferredAsRegulatoryAssetOrLiability	-10000000	USD
CY2014	pnw	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Derivative Gain Loss Deferred As Regulatory Asset Or Liability FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDerivativeGainLossDeferredAsRegulatoryAssetOrLiability	0	USD
CY2013	pnw	Fair Value Net Derivative Asset Liability Measuredon Recurring Basis Changein Unrealized Gain Loss FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasisChangeinUnrealizedGainLoss	0	USD
CY2014	pnw	Fair Value Net Derivative Asset Liability Measuredon Recurring Basis Changein Unrealized Gain Loss FairValueNetDerivativeAssetLiabilityMeasuredonRecurringBasisChangeinUnrealizedGainLoss	0	USD
CY2012	pnw	Income Tax Expense Benefit Continuing And Discontinued Operations IncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations	233504000	USD
CY2013	pnw	Income Tax Expense Benefit Continuing And Discontinued Operations IncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations	230591000	USD
CY2014	pnw	Income Tax Expense Benefit Continuing And Discontinued Operations IncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations	220705000	USD
CY2012	pnw	Income Tax Reconciliation Allowance For Equity Funds Used During Construction IncomeTaxReconciliationAllowanceForEquityFundsUsedDuringConstruction	6158000	USD
CY2013	pnw	Income Tax Reconciliation Allowance For Equity Funds Used During Construction IncomeTaxReconciliationAllowanceForEquityFundsUsedDuringConstruction	6997000	USD
CY2014	pnw	Income Tax Reconciliation Allowance For Equity Funds Used During Construction IncomeTaxReconciliationAllowanceForEquityFundsUsedDuringConstruction	8523000	USD
CY2012	pnw	Income Tax Reconciliation Tax Credits And Adjustments Prior Years IncomeTaxReconciliationTaxCreditsAndAdjustmentsPriorYears	0	USD
CY2013	pnw	Income Tax Reconciliation Tax Credits And Adjustments Prior Years IncomeTaxReconciliationTaxCreditsAndAdjustmentsPriorYears	3356000	USD
CY2014	pnw	Income Tax Reconciliation Tax Credits And Adjustments Prior Years IncomeTaxReconciliationTaxCreditsAndAdjustmentsPriorYears	0	USD
CY2012	pnw	Increase Decrease Deferred Fuel And Purchased Power Amortization IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization	-116716000	USD
CY2013	pnw	Increase Decrease Deferred Fuel And Purchased Power Amortization IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization	31190000	USD
CY2014	pnw	Increase Decrease Deferred Fuel And Purchased Power Amortization IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization	40757000	USD
CY2013Q3	pnw	Increase Decrease In Deferred Income Taxes Due To Regulation Adoption IncreaseDecreaseInDeferredIncomeTaxesDueToRegulationAdoption	82000000	USD
CY2014	pnw	Increase Decrease In Deferred Income Taxes Due To Regulation Adoption IncreaseDecreaseInDeferredIncomeTaxesDueToRegulationAdoption	26000000	USD
CY2012	pnw	Increase Decreasein Income Taxes Receivable Noncurrent IncreaseDecreaseinIncomeTaxesReceivableNoncurrent	1756000	USD
CY2013	pnw	Increase Decreasein Income Taxes Receivable Noncurrent IncreaseDecreaseinIncomeTaxesReceivableNoncurrent	-137270000	USD
CY2014	pnw	Increase Decreasein Income Taxes Receivable Noncurrent IncreaseDecreaseinIncomeTaxesReceivableNoncurrent	0	USD
CY2012	pnw	Miscellaneous Other Nonoperating Expense MiscellaneousOtherNonoperatingExpense	9612000	USD
CY2013	pnw	Miscellaneous Other Nonoperating Expense MiscellaneousOtherNonoperatingExpense	4106000	USD
CY2014	pnw	Miscellaneous Other Nonoperating Expense MiscellaneousOtherNonoperatingExpense	2663000	USD
CY2012	pnw	Miscellaneous Other Nonoperating Income MiscellaneousOtherNonoperatingIncome	367000	USD
CY2013	pnw	Miscellaneous Other Nonoperating Income MiscellaneousOtherNonoperatingIncome	75000	USD
CY2014	pnw	Miscellaneous Other Nonoperating Income MiscellaneousOtherNonoperatingIncome	212000	USD
CY2012	pnw	Nonoperating Costs NonoperatingCosts	7777000	USD
CY2013	pnw	Nonoperating Costs NonoperatingCosts	8207000	USD
CY2014	pnw	Nonoperating Costs NonoperatingCosts	9657000	USD
CY2014Q4	pnw	Percentage Of Unrealized Gains And Losses On Certain Derivatives Deferred For Future Rate Treatment PercentageOfUnrealizedGainsAndLossesOnCertainDerivativesDeferredForFutureRateTreatment	1
CY2012Q3	pnw	Regulatory Asset Amortization Period RegulatoryAssetAmortizationPeriod	P3Y
CY2013Q4	pnw	Regulatory Asset Including Deferred Fuel And Purchased Power Regulatory Asset Current RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent	97000000	USD
CY2014Q4	pnw	Regulatory Asset Including Deferred Fuel And Purchased Power Regulatory Asset Current RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent	138000000	USD
CY2013Q4	pnw	Regulatory Liability Including Deferred Fuel And Purchased Power Regulatory Liability Current RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent	99000000	USD
CY2014Q4	pnw	Regulatory Liability Including Deferred Fuel And Purchased Power Regulatory Liability Current RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent	131000000	USD
CY2013Q4	pnw	Total Deferred Debits TotalDeferredDebits	849395000	USD
CY2014Q4	pnw	Total Deferred Debits TotalDeferredDebits	1360234000	USD
CY2013Q4	pnw	Total Investments And Other Assets TotalInvestmentsAndOtherAssets	726697000	USD
CY2014Q4	pnw	Total Investments And Other Assets TotalInvestmentsAndOtherAssets	785533000	USD
CY2014Q4	pnw	Unrecognized Tax Benefits Interest On Income Taxes Receivable UnrecognizedTaxBenefitsInterestOnIncomeTaxesReceivable	1000000	USD
CY2013Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	284516000	USD
CY2014Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	295211000	USD
CY2013Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	299904000	USD
CY2014Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	297740000	USD
CY2013Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	152361000	USD
CY2014Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	178607000	USD
CY2013Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	5300219000	USD
CY2014Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	5397751000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-23058000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-10385000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	54995000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	57756000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-114008000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-78053000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-68141000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	32000000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	25000000	USD
CY2014	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	33000000	USD
CY2013Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3203000	USD
CY2014Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3094000	USD
CY2012	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	-14971000	USD
CY2013	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	-14861000	USD
CY2013Q4	us-gaap	Assets Assets	13508686000	USD
CY2014Q4	us-gaap	Assets Assets	14313532000	USD
CY2013Q4	us-gaap	Assets Current AssetsCurrent	1043609000	USD
CY2014Q4	us-gaap	Assets Current AssetsCurrent	973435000	USD
CY2013Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	41000000	USD
CY2014	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	-15457000	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	50000000	USD
CY2013	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	53000000	USD
CY2014	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	53000000	USD
CY2012	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	4000000	USD
CY2013	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	8000000	USD
CY2014	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	8000000	USD
CY2013Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	32896000	USD
CY2014Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	32462000	USD
CY2013Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	313833000	USD
CY2014Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	358288000	USD
CY2014Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	33000000	USD
CY2012	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	26208000	USD
CY2013	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	33184000	USD
CY2014	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	44712000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	33583000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	26202000	USD
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	9526000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	7604000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-7381000	USD
CY2013	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-16676000	USD
CY2014	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-1922000	USD
CY2013Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2014Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.67
CY2013	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.23
CY2014	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.33
CY2013Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue
CY2014Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue
CY2013Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	150000000	shares
CY2014Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	150000000	shares
CY2013Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	110280703	shares
CY2014Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	110649762	shares
CY2013Q4	us-gaap	Common Stock Value CommonStockValue	2491558000	USD
CY2014Q4	us-gaap	Common Stock Value CommonStockValue	2512970000	USD
CY2013Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	2487250000	USD
CY2014Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	2509569000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	419697000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	442029000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	407507000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	451319000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	475921000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	433608000	USD
CY2013Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	581369000	USD
CY2014Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	682807000	USD
CY2012	us-gaap	Cost Of Goods Sold Electric CostOfGoodsSoldElectric	994790000	USD
CY2013	us-gaap	Cost Of Goods Sold Electric CostOfGoodsSoldElectric	1095709000	USD
CY2014	us-gaap	Cost Of Goods Sold Electric CostOfGoodsSoldElectric	1179829000	USD
CY2012	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	404336000	USD
CY2013	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	415708000	USD
CY2014	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	417358000	USD
CY2012	us-gaap	Costs And Expenses CostsAndExpenses	2450049000	USD
CY2013	us-gaap	Costs And Expenses CostsAndExpenses	2608305000	USD
CY2014	us-gaap	Costs And Expenses CostsAndExpenses	2680390000	USD
CY2013Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	96796000	USD
CY2014Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	100533000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-3493000	USD
CY2013	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-81784000	USD
CY2014	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	25054000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	4902000	USD
CY2013	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-71247000	USD
CY2014	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	35436000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	8395000	USD
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	10537000	USD
CY2014	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	10382000	USD
CY2013Q4	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	114480000	USD
CY2014Q4	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	123052000	USD
CY2013Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	76101000	USD
CY2014Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	72307000	USD
CY2013Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	3337000000	USD
CY2014Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	3415000000	USD
CY2013Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	642007000	USD
CY2014Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	713866000	USD
CY2013Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	4753117000	USD
CY2014Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	5204072000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	200322000	USD
CY2013	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	279973000	USD
CY2014	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	167365000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	187023000	USD
CY2013	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	249296000	USD
CY2014	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	159023000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	28280000	USD
CY2013	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	21865000	USD
CY2013Q4	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	23815000	USD
CY2014	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	17904000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	44920000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	57505000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-2260730000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-2460404000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	91152000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	122232000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	951242000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1011886000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	4000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	148492000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	138729000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards General Business DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness	90000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	140773000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	205227000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	57869000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	0	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	3211972000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	3472290000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	16191000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	12171000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	2351882000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	2582636000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	4916000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	5484000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2903730000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2958369000	USD
CY2013	us-gaap	Defined Benefit Plan Amortization Of Transition Obligations Assets DefinedBenefitPlanAmortizationOfTransitionObligationsAssets	0	USD
CY2014	us-gaap	Defined Benefit Plan Amortization Of Transition Obligations Assets DefinedBenefitPlanAmortizationOfTransitionObligationsAssets	0	USD
CY2013Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	0	USD
CY2014Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	152290000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.0400
CY2014Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.0400
CY2012	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate DefinedBenefitPlanUltimateHealthCareCostTrendRate	0.0500
CY2013	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate DefinedBenefitPlanUltimateHealthCareCostTrendRate	0.0500
	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate DefinedBenefitPlanUltimateHealthCareCostTrendRate	0.0500
CY2014Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate DefinedBenefitPlanUltimateHealthCareCostTrendRate	0.0500
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	481262000	USD
CY2013	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	492322000	USD
CY2014	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	496487000	USD
CY2013Q4	us-gaap	Derivative Instruments And Hedges DerivativeInstrumentsAndHedges	17169000	USD
CY2014Q4	us-gaap	Derivative Instruments And Hedges DerivativeInstrumentsAndHedges	13785000	USD
CY2013Q4	us-gaap	Derivative Instruments And Hedges Liabilities DerivativeInstrumentsAndHedgesLiabilities	31892000	USD
CY2014Q4	us-gaap	Derivative Instruments And Hedges Liabilities DerivativeInstrumentsAndHedgesLiabilities	59676000	USD
CY2014Q4	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	17620000	USD
CY2013Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	70315000	USD
CY2014Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	50602000	USD
CY2012	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-3813000	USD
CY2013	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	0	USD
CY2014	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	0	USD
CY2012	us-gaap	Dividends Common Stock DividendsCommonStock	291923000	USD
CY2013	us-gaap	Dividends Common Stock DividendsCommonStock	244903000	USD
CY2014	us-gaap	Dividends Common Stock DividendsCommonStock	256803000	USD
CY2013Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	62528000	USD
CY2014Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	65790000	USD
CY2012Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	59789000	USD
CY2013Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	62528000	USD
CY2014Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	65790000	USD
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.48
CY2013Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.22
CY2013Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.19
CY2013Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.06
CY2013Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.22
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.69
CY2014Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.14
CY2014Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.20
CY2014Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.20
CY2014Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.05
CY2014	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.59
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.45
CY2013Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.22
CY2013Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.18
CY2013Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.04
CY2013Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.22
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.66
CY2014Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.14
CY2014Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.19
CY2014Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.20
CY2014Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.05
CY2014	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.58
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2013	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2014	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2014Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	15000000	USD
CY2014	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	13000000	USD
CY2013	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	10000000	USD
CY2014	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	13000000	USD
CY2013Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	38028000	USD
CY2014Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	37097000	USD
CY2013	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss	0	USD
CY2014	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss	0	USD
CY2013	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	0	USD
CY2014	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	0	USD
CY2014	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements	-12000000	USD
CY2013	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Into Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3	0	USD
CY2013	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements	-10000000	USD
CY2013Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	439703000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	439966000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	489538000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	42000000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	3000000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	9000000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	21000000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	32000000	USD
CY2014	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Into Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3	-2000000	USD
CY2013	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	1000000	USD
CY2014	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	2000000	USD
CY2012Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	-48000000	USD
CY2013Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	-49000000	USD
CY2014Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	-41000000	USD
CY2014	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P6Y
CY2012	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	0	USD
CY2014	us-gaap	Gain On Sale Of Investments GainOnSaleOfInvestments	8386000	USD
CY2012	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	387380000	USD
CY2013	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	406074000	USD
CY2014	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	397595000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	656310000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	670557000	USD
CY2014	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	644401000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	418993000	USD
CY2013Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	32836000	USD
CY2013Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	139598000	USD
CY2013Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	234718000	USD
CY2013Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	32814000	USD
CY2014Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	24691000	USD
CY2014Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	141384000	USD
CY2014Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	248086000	USD
CY2014Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	9535000	USD
CY2014	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	423696000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.54
CY2013	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.69
CY2014	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.59
CY2012	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.50
CY2013	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.66
CY2014	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.58
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-5829000	USD
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2014	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-5838000	USD
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2014	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	0	USD
CY2013	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	133094000	USD
CY2014	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-132419000	USD
CY2013Q4	us-gaap	Income Tax Examination Liability Refund Adjustment From Settlement With Taxing Authority IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority	-133000000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	237317000	USD
CY2013Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12469000	USD
CY2013Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	77043000	USD
CY2013Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	131912000	USD
CY2013Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9167000	USD
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	230591000	USD
CY2014Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6405000	USD
CY2014Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	74540000	USD
CY2014Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	134753000	USD
CY2014Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5007000	USD
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	220705000	USD
CY2012	us-gaap	Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy	-483000	USD
CY2013	us-gaap	Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy	-823000	USD
CY2014	us-gaap	Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy	-830000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	229709000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	234695000	USD
CY2014	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	225540000	USD
CY2012	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	11065000	USD
CY2013	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	11862000	USD
CY2014	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	9135000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	2559000	USD
CY2013	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-551000	USD
CY2014	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1228000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	23819000	USD
CY2013	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	21387000	USD
CY2014	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	18149000	USD
CY2012	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	2030000	USD
CY2013	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	3548000	USD
CY2014	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	4928000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2543000	USD
CY2013	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	18537000	USD
CY2014	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-102154000	USD
CY2013Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	135517000	USD
CY2014Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	3098000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-96600000	USD
CY2013	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	45414000	USD
CY2014	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-353000	USD
CY2012	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	12736000	USD
CY2013	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	6059000	USD
CY2014	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	9615000	USD
CY2012	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	-2216000	USD
CY2013	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	-993000	USD
CY2014	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	343000	USD
CY2012	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	4043000	USD
CY2014	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-4384000	USD
CY2012	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	-14587000	USD
CY2013	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	44991000	USD
CY2014	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	52672000	USD
CY2012	us-gaap	Increase Decrease In Regulatory Clause Revenue IncreaseDecreaseInRegulatoryClauseRevenue	71573000	USD
CY2013	us-gaap	Increase Decrease In Regulatory Clause Revenue IncreaseDecreaseInRegulatoryClauseRevenue	21678000	USD
CY2014	us-gaap	Increase Decrease In Regulatory Clause Revenue IncreaseDecreaseInRegulatoryClauseRevenue	-26927000	USD
CY2012	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	13539000	USD
CY2013	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	64473000	USD
CY2014	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	59618000	USD
CY2012	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	-30394000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	23043000	USD
CY2013	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	11878000	USD
CY2014	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-3724000	USD
CY2012	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	23869000	USD
CY2013	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-7513000	USD
CY2013	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	1951000	USD
CY2014	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	3737000	USD
CY2014	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	17892000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-6872000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	41757000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	59344000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	29801000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-24682000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-78210000	USD
CY2012	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	27352000	USD
CY2013	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	17913000	USD
CY2013Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	157689000	USD
CY2014Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	119755000	USD
CY2012	us-gaap	Interest Costs Incurred InterestCostsIncurred	214616000	USD
CY2013	us-gaap	Interest Costs Incurred InterestCostsIncurred	201888000	USD
CY2014	us-gaap	Interest Costs Incurred InterestCostsIncurred	200950000	USD
CY2012	us-gaap	Interest Expense InterestExpense	199645000	USD
CY2013	us-gaap	Interest Expense InterestExpense	187027000	USD
CY2014	us-gaap	Interest Expense InterestExpense	185493000	USD
CY2012	us-gaap	Interest Paid Net InterestPaidNet	200923000	USD
CY2013	us-gaap	Interest Paid Net InterestPaidNet	184010000	USD
CY2014	us-gaap	Interest Paid Net InterestPaidNet	177074000	USD
CY2013Q4	us-gaap	Interest Payable Current InterestPayableCurrent	48351000	USD
CY2014Q4	us-gaap	Interest Payable Current InterestPayableCurrent	52603000	USD
CY2012	us-gaap	Investment Income Interest InvestmentIncomeInterest	1239000	USD
CY2013	us-gaap	Investment Income Interest InvestmentIncomeInterest	1629000	USD
CY2014	us-gaap	Investment Income Interest InvestmentIncomeInterest	1010000	USD
CY2012	us-gaap	Investment Tax Credit InvestmentTaxCredit	41579000	USD
CY2013	us-gaap	Investment Tax Credit InvestmentTaxCredit	52542000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1171122000	USD
CY2014Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	19377000	USD
CY2014	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	0	USD
CY2013Q4	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	207453000	USD
CY2014Q4	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	198292000	USD
CY2014	us-gaap	Investment Tax Credit InvestmentTaxCredit	26246000	USD
CY2012	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	19000000	USD
CY2013	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	18000000	USD
CY2014	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	18000000	USD
CY2013Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1618644000	USD
CY2013Q4	us-gaap	Minority Interest MinorityInterest	145990000	USD
CY2014Q4	us-gaap	Minority Interest MinorityInterest	151609000	USD
CY2012	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	10875000	USD
CY2013Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	13508686000	USD
CY2014Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	14313532000	USD
CY2012	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	0	USD
CY2013	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	145609000	USD
CY2014Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1559143000	USD
CY2013Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	90000000	USD
CY2014Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	74000000	USD
CY2013Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	42209000	USD
CY2013	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	17385000	USD
CY2014	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	20482000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-305509000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-160582000	USD
CY2014	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-178881000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-872994000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1009401000	USD
CY2014	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-922668000	USD
CY2013Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	3579000000	USD
CY2014Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	3839000000	USD
CY2013Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2796465000	USD
CY2014Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	3031215000	USD
CY2012	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	2453000	USD
CY2013	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	3711000	USD
CY2014	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	9426000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1153307000	USD
CY2014	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1099627000	USD
CY2012	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	31622000	USD
CY2013	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	33892000	USD
CY2014	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	26101000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	381542000	USD
CY2013Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	24444000	USD
CY2013Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	131207000	USD
CY2013Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	226163000	USD
CY2013Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	24260000	USD
CY2013	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	406074000	USD
CY2014Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	15766000	USD
CY2014Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	132458000	USD
CY2014Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	243961000	USD
CY2014Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	5410000	USD
CY2014	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	397595000	USD
CY2012	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	4200000	USD
CY2013	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	11261000	USD
CY2014	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	18652000	USD
CY2013Q4	us-gaap	Nuclear Fuel Net Of Amortization NuclearFuelNetOfAmortization	124557000	USD
CY2014Q4	us-gaap	Nuclear Fuel Net Of Amortization NuclearFuelNetOfAmortization	125201000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	851755000	USD
CY2013Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	86923000	USD
CY2013Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	259812000	USD
CY2013Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	415688000	USD
CY2013Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	83900000	USD
CY2013	us-gaap	Operating Income Loss OperatingIncomeLoss	846323000	USD
CY2014Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	75170000	USD
CY2014Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	254113000	USD
CY2014Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	421775000	USD
CY2014Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	60184000	USD
CY2014	us-gaap	Operating Income Loss OperatingIncomeLoss	811242000	USD
CY2014Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	99000000	USD
CY2014Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	18000000	USD
CY2014Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	3000000	USD
CY2014Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	4000000	USD
CY2014Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	5000000	USD
CY2014Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	6000000	USD
CY2014Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	63000000	USD
CY2013Q4	us-gaap	Other Assets Current OtherAssetsCurrent	39895000	USD
CY2014Q4	us-gaap	Other Assets Current OtherAssetsCurrent	38817000	USD
CY2013Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	60875000	USD
CY2014Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	54047000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	5381000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-6229000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	38155000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	35955000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	9912000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1031000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-9421000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	2761000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-651000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-6156000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	1307000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-59887000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-26747000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-13483000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	39120000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	17472000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	7932000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-22763000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-213000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-810000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-14900000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-140000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	438000	USD
CY2012	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	6831000	USD
CY2013	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	7994000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	225075000	USD
CY2013	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	235244000	USD
CY2014	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	246671000	USD
CY2012	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	889551000	USD
CY2013	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1016322000	USD
CY2014	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2883000	USD
CY2013Q4	us-gaap	Other Deferred Costs Net OtherDeferredCostsNet	137683000	USD
CY2014Q4	us-gaap	Other Deferred Costs Net OtherDeferredCostsNet	153857000	USD
CY2013Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	221682000	USD
CY2014Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	218889000	USD
CY2013Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	158540000	USD
CY2014Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	178962000	USD
CY2013Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	185659000	USD
CY2014Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	188286000	USD
CY2013Q4	us-gaap	Other Long Term Debt Current OtherLongTermDebtCurrent	540424000	USD
CY2014Q4	us-gaap	Other Long Term Debt Current OtherLongTermDebtCurrent	383570000	USD
CY2012	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	19842000	USD
CY2013	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	16024000	USD
CY2014	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	21746000	USD
CY2012	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	1606000	USD
CY2013	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	1704000	USD
CY2014	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	9608000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1099000	USD
CY2013	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	2059000	USD
CY2014	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-347000	USD
CY2014	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	910634000	USD
CY2012	us-gaap	Payments To Invest In Decommissioning Fund PaymentsToInvestInDecommissioningFund	434852000	USD
CY2013	us-gaap	Payments To Invest In Decommissioning Fund PaymentsToInvestInDecommissioningFund	463274000	USD
CY2014	us-gaap	Payments To Invest In Decommissioning Fund PaymentsToInvestInDecommissioningFund	373444000	USD
CY2012	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	10529000	USD
CY2013	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	17385000	USD
CY2014	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	20482000	USD
CY2013Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	513628000	USD
CY2014Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	453736000	USD
CY2012	us-gaap	Proceeds From Contribution In Aid Of Construction ProceedsFromContributionInAidOfConstruction	49876000	USD
CY2013	us-gaap	Proceeds From Contribution In Aid Of Construction ProceedsFromContributionInAidOfConstruction	41090000	USD
CY2014	us-gaap	Proceeds From Contribution In Aid Of Construction ProceedsFromContributionInAidOfConstruction	20325000	USD
CY2012	us-gaap	Proceeds From Decommissioning Fund ProceedsFromDecommissioningFund	417603000	USD
CY2013	us-gaap	Proceeds From Decommissioning Fund ProceedsFromDecommissioningFund	446025000	USD
CY2014	us-gaap	Proceeds From Decommissioning Fund ProceedsFromDecommissioningFund	356195000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	15955000	USD
CY2013	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	17319000	USD
CY2014	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	15288000	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	476081000	USD
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	136307000	USD
CY2014	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	161000	USD
CY2014	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	731126000	USD
CY2012	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	170000	USD
CY2013	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	299000	USD
CY2014	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-16141000	USD
CY2012	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	92175000	USD
CY2013	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	60950000	USD
CY2014	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-5725000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	413164000	USD
CY2013	us-gaap	Profit Loss ProfitLoss	439966000	USD
CY2014	us-gaap	Profit Loss ProfitLoss	423696000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	15200464000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	15543063000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	9900245000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10145312000	USD
CY2012	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	22436000	USD
CY2013	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	25581000	USD
CY2014	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	30790000	USD
CY2012	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	-14971000	USD
CY2013	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	-14861000	USD
CY2014	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	-15457000	USD
CY2012	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.0860
CY2013	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.0856
CY2014	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.0847
CY2012	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0271
CY2013	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0300
CY2014	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0277
CY2013Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	10888985000	USD
CY2014Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	11194330000	USD
CY2013	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-30574000	USD
CY2013Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	76388000	USD
CY2014Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	129808000	USD
CY2013Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	711712000	USD
CY2014Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1054087000	USD
CY2013Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	99273000	USD
CY2014Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	130549000	USD
CY2013Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	801297000	USD
CY2014Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1051196000	USD
CY2012	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	654286000	USD
CY2013	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	122828000	USD
CY2014	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	652578000	USD
CY2013Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1785273000	USD
CY2014Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1926065000	USD
CY2013Q4	us-gaap	Sale Leaseback Transaction Accumulated Depreciation SaleLeasebackTransactionAccumulatedDepreciation	225925000	USD
CY2014Q4	us-gaap	Sale Leaseback Transaction Accumulated Depreciation SaleLeasebackTransactionAccumulatedDepreciation	229795000	USD
CY2012	us-gaap	Sales Revenue Net SalesRevenueNet	3301804000	USD
CY2013Q1	us-gaap	Sales Revenue Net SalesRevenueNet	686652000	USD
CY2013Q2	us-gaap	Sales Revenue Net SalesRevenueNet	915822000	USD
CY2013Q3	us-gaap	Sales Revenue Net SalesRevenueNet	1152392000	USD
CY2013Q4	us-gaap	Sales Revenue Net SalesRevenueNet	699762000	USD
CY2013	us-gaap	Sales Revenue Net SalesRevenueNet	3454628000	USD
CY2014Q1	us-gaap	Sales Revenue Net SalesRevenueNet	686251000	USD
CY2014Q2	us-gaap	Sales Revenue Net SalesRevenueNet	906264000	USD
CY2014Q3	us-gaap	Sales Revenue Net SalesRevenueNet	1172667000	USD
CY2014Q4	us-gaap	Sales Revenue Net SalesRevenueNet	726450000	USD
CY2014	us-gaap	Sales Revenue Net SalesRevenueNet	3491632000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	19000000	USD
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	20000000	USD
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	20000000	USD
CY2013Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	153125000	USD
CY2014Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	147400000	USD
CY2012	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	22676000	USD
CY2013	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	24635000	USD
CY2014	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	21412000	USD
CY2012	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	5113000	USD
CY2013	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	9630000	USD
CY2014	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	8800000	USD
CY2013Q4	us-gaap	Stockholders Equity StockholdersEquity	4194470000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	4367493000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3930586000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4102289000	USD
CY2013Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4340460000	USD
CY2014Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4519102000	USD
CY2012	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	159323000	USD
CY2013	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	164167000	USD
CY2014	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	172295000	USD
CY2013Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	130998000	USD
CY2014Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	140613000	USD
CY2013Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	98944	shares
CY2014Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	78400	shares
CY2013Q4	us-gaap	Treasury Stock Value TreasuryStockValue	4308000	USD
CY2014Q4	us-gaap	Treasury Stock Value TreasuryStockValue	3401000	USD
CY2012	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	4607000	USD
CY2013	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	9727000	USD
CY2014	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	7893000	USD
CY2012	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	749000	USD
CY2013	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-534000	USD
CY2014	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-339000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	136005000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	133422000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	41997000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	44775000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	-2583000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	-91425000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	2778000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	21000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2014	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	10000000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	10000000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	11000000	USD
CY2012	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	884769000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	7729000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	108099000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	2282000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2014	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	5167000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3516000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	4309000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	13158000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	751000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	13000000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	1000000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	1000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	4000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	-4000000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	1000000	USD
CY2013Q1	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	223250000	USD
CY2013Q2	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	229300000	USD
CY2013Q3	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	233323000	USD
CY2013Q4	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	238854000	USD
CY2013	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	924727000	USD
CY2014Q1	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	212882000	USD
CY2014Q2	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	211222000	USD
CY2014Q3	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	223418000	USD
CY2014Q4	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	260503000	USD
CY2014	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	908025000	USD
CY2013Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	125125000	USD
CY2014Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	121255000	USD
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	110527000	shares
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	110806000	shares
CY2014	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	111178000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	109510000	shares
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	109984000	shares
CY2014	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110626000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	1017000	shares
CY2013	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	822000	shares
CY2014	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	552000	shares
CY2014	us-gaap	Revenue Recognition Sales Of Services RevenueRecognitionSalesOfServices	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:11.5pt;"><font style="font-family:inherit;font-size:11.5pt;font-weight:bold;">Electric Revenues</font></div><div style="line-height:120%;font-size:11.5pt;"><font style="font-family:inherit;font-size:11.5pt;"> </font></div><div style="line-height:120%;text-indent:48px;font-size:11.5pt;"><font style="font-family:inherit;font-size:11.5pt;">We derive electric revenues primarily from sales of electricity to our regulated Native Load customers.  Revenues related to the sale of electricity are generally recorded when service is rendered or electricity is delivered to customers.  The billing of electricity sales to individual Native Load customers is based on the reading of their meters, which occurs on a systematic basis throughout the month.  Unbilled revenues are estimated by applying an average revenue/kWh by customer class to the number of estimated kWhs delivered but not billed.  Differences historically between the actual and estimated unbilled revenues are immaterial.  We exclude sales taxes and franchise fees on electric revenues from both revenue and taxes other than income taxes.</font></div><div style="line-height:120%;text-indent:48px;font-size:11.5pt;"><font style="font-family:inherit;font-size:11.5pt;"> </font></div><div style="line-height:120%;text-indent:48px;font-size:11.5pt;"><font style="font-family:inherit;font-size:11.5pt;">Revenues from our Native Load customers and non-derivative instruments are reported on a gross basis on Pinnacle West’s Consolidated Statements of Income.  In the electricity business, some contracts to purchase energy are netted against other contracts to sell energy.  This is called a “book-out” and usually occurs for contracts that have the same terms (quantities and delivery points) and for which power does not flow.  We net these book-outs, which reduces both revenues and fuel and purchased power costs.</font></div><div style="line-height:120%;text-indent:48px;font-size:11.5pt;"><font style="font-family:inherit;font-size:11.5pt;"> </font></div><div style="line-height:120%;text-indent:48px;font-size:11.5pt;"><font style="font-family:inherit;font-size:11.5pt;">For the period January 1, 2010 through June 30, 2012, electric revenues also include proceeds for line extension payments for new or upgraded service in accordance with the 2009 Settlement Agreement (see Note 3).  Effective July 1, 2012, as a result of the 2012 Settlement Agreement, these amounts are now recorded as contributions in aid of construction and are not included in electric revenues.</font></div><div style="line-height:120%;text-indent:48px;font-size:11.5pt;"><font style="font-family:inherit;font-size:11.5pt;"> </font></div><div style="line-height:120%;text-indent:48px;font-size:11.5pt;"><font style="font-family:inherit;font-size:11.5pt;">Some of our cost recovery mechanisms are alternative revenue programs.  For alternative revenue programs that meet specified accounting criteria, we recognize revenues when the specific events permitting billing of the additional revenues have been completed.</font></div></div>
CY2014	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:11.5pt;"><font style="font-family:inherit;font-size:11.5pt;font-weight:bold;">Accounting Records and Use of Estimates</font></div><div style="line-height:120%;font-size:11.5pt;"><font style="font-family:inherit;font-size:11.5pt;"> </font></div><div style="line-height:120%;text-indent:48px;font-size:11.5pt;"><font style="font-family:inherit;font-size:11.5pt;">Our accounting records are maintained in accordance with GAAP.  The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and reported amounts of revenues and expenses during the reporting period.  Actual results could differ from those estimates.</font></div></div>

Files In Submission

Name	View Source	Status
0000764622-15-000013-index-headers.html	Edgar Link	pending
0000764622-15-000013-index.html	Edgar Link	pending
0000764622-15-000013.txt	Edgar Link	pending
0000764622-15-000013-xbrl.zip	Edgar Link	pending
a141205685x11apsserviceterri.jpg	Edgar Link	pending
correspondenceimage1.gif	Edgar Link	pending
ex121-123114.htm	Edgar Link	pending
ex122-123114.htm	Edgar Link	pending
ex123-123114.htm	Edgar Link	pending
exhibit10112.htm	Edgar Link	pending
exhibit10112image1.gif	Edgar Link	pending
exhibit1032a.htm	Edgar Link	pending
exhibit1049.htm	Edgar Link	pending
exhibit1066.htm	Edgar Link	pending
exhibit211.htm	Edgar Link	pending
exhibit231.htm	Edgar Link	pending
exhibit232.htm	Edgar Link	pending
exhibit311.htm	Edgar Link	pending
exhibit312.htm	Edgar Link	pending
exhibit313.htm	Edgar Link	pending
exhibit314.htm	Edgar Link	pending
exhibit321pnw.htm	Edgar Link	pending
exhibit322aps.htm	Edgar Link	pending
exhibit46e.htm	Edgar Link	pending
exhibit46f.htm	Edgar Link	pending
exhibit46g.htm	Edgar Link	pending
exhibit46h.htm	Edgar Link	pending
exhibit46i.htm	Edgar Link	pending
exhibit46j.htm	Edgar Link	pending
filename35.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
pnw-20141231.xml	Edgar Link	completed
pnw-20141231.xsd	Edgar Link	pending
pnw-20141231_cal.xml	Edgar Link	unprocessable
pnw-20141231_def.xml	Edgar Link	unprocessable
pnw-20141231_lab.xml	Edgar Link	unprocessable
pnw-20141231_pre.xml	Edgar Link	unprocessable
pnw12311410-k.htm	Edgar Link	pending
pnw123114_chart-53681.jpg	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R102.htm	Edgar Link	pending
R103.htm	Edgar Link	pending
R104.htm	Edgar Link	pending
R105.htm	Edgar Link	pending
R106.htm	Edgar Link	pending
R107.htm	Edgar Link	pending
R108.htm	Edgar Link	pending
R109.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R110.htm	Edgar Link	pending
R111.htm	Edgar Link	pending
R112.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
R97.htm	Edgar Link	pending
R98.htm	Edgar Link	pending
R99.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$PNW
PINNACLE WEST CAPITAL CORP Stock $pnw

2014 Form 10-K Financial Statement

#000076462215000013 Filed on February 20, 2015

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$PNW PINNACLE WEST CAPITAL CORP Stock $pnw

2014 Form 10-K Financial Statement

#000076462215000013 Filed on February 20, 2015

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$PNW
PINNACLE WEST CAPITAL CORP Stock $pnw