$PNW
PINNACLE WEST CAPITAL CORP Stock $pnw

$pnw Overview Financials Valuation SEC Filings Company Website

2015 Q4 Form 10-K Financial Statement

#000076462217000010 Filed on February 24, 2017

Income Statement

Concept	2015 Q4	2015 Q3	2015 Q2
Revenue	$734.4M	$1.199B	$890.6M
YoY Change	1.1%	2.26%	-1.72%
Cost Of Revenue		$363.8M	$281.5M
YoY Change		-4.84%	-3.22%
Gross Profit		$835.3M	$609.2M
YoY Change		5.69%	-1.01%
Gross Profit Margin		69.66%	68.4%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$143.6M	$145.9M	$140.7M
YoY Change	15.06%	16.44%	13.47%
% of Gross Profit		17.47%	23.1%
Operating Expenses	$600.7M	$703.1M	$669.3M
YoY Change	-0.03%	-3.29%	1.87%
Operating Profit	$109.8M	$445.1M	$232.0M
YoY Change	82.5%	5.53%	-8.71%
Interest Expense	-$59.90M	$45.82M	$44.01M
YoY Change	-40.87%	3.8%	-8.25%
% of Operating Profit	-54.54%	10.29%	18.97%
Other Income/Expense, Net	-$5.000M	$2.246M	$6.911M
YoY Change	-48.98%	-56.9%	-29.28%
Pretax Income	$68.80M	$401.5M	$194.9M
YoY Change	374.48%	4.88%	-9.75%
Income Tax	$22.85M	$139.6M	$67.37M
% Of Pretax Income	33.21%	34.76%	34.57%
Net Earnings	$45.98M	$262.0M	$127.5M
YoY Change	382.2%	5.6%	-9.82%
Net Earnings / Revenue	6.26%	21.85%	14.32%
Basic Earnings Per Share	$0.37	$2.32	$1.11
Diluted Earnings Per Share	$0.37	$2.30	$1.10
COMMON SHARES
Basic Shares Outstanding	110.8M shares	111.0M shares	111.0M shares
Diluted Shares Outstanding		111.6M shares	111.5M shares

Balance Sheet

Concept	2015 Q4	2015 Q3	2015 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$39.00M	$13.00M	$14.00M
YoY Change	387.5%	30.0%	55.56%
Cash & Equivalents	$39.49M	$13.01M	$13.56M
Short-Term Investments
Other Short-Term Assets	$37.24M	$38.44M	$44.83M
YoY Change	-4.06%	-5.49%	-7.49%
Inventory	$280.0M	$279.0M	$274.0M
Prepaid Expenses
Receivables	$272.0M	$358.0M	$287.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$890.5M	$1.062B	$1.032B
YoY Change	-8.52%	2.02%	3.27%
LONG-TERM ASSETS
Property, Plant & Equipment	$10.63B	$10.46B	$10.43B
YoY Change	4.76%	5.2%	3.68%
Goodwill
YoY Change
Intangibles	$124.0M	$134.9M	$127.7M
YoY Change	3.52%	5.78%	-6.78%
Long-Term Investments
YoY Change
Other Assets	$52.52M	$52.49M	$51.99M
YoY Change	-2.83%	-13.14%	-15.3%
Total Long-Term Assets	$14.14B	$13.81B	$13.67B
YoY Change	6.18%	6.75%	7.71%
TOTAL ASSETS
Total Short-Term Assets	$890.5M	$1.062B	$1.032B
Total Long-Term Assets	$14.14B	$13.81B	$13.67B
Total Assets	$15.03B	$14.88B	$14.70B
YoY Change	5.17%	6.4%	7.39%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$297.5M	$234.0M	$326.1M
YoY Change	0.77%	-16.09%	1.66%
Accrued Expenses	$56.00M	$40.00M	$55.00M
YoY Change	5.66%	-2.44%	3.77%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$57.00M	$157.5M
YoY Change	-100.0%	197.65%	-10.84%
Long-Term Debt Due	$358.0M	$411.0M	$103.0M
YoY Change	-6.77%	11.38%	-72.09%
Total Short-Term Liabilities	$1.442B	$1.523B	$1.340B
YoY Change	-7.49%	5.17%	-13.82%
LONG-TERM LIABILITIES
Long-Term Debt	$3.462B	$3.257B	$3.566B
YoY Change	15.16%	7.23%	18.88%
Other Long-Term Liabilities	$186.3M	$184.0M	$196.2M
YoY Change	-1.03%	3.68%	0.02%
Total Long-Term Liabilities	$3.649B	$3.441B	$3.762B
YoY Change	14.21%	7.03%	17.72%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.442B	$1.523B	$1.340B
Total Long-Term Liabilities	$3.649B	$3.441B	$3.762B
Total Liabilities	$5.091B	$4.965B	$5.102B
YoY Change	7.09%	6.45%	7.4%
SHAREHOLDERS EQUITY
Retained Earnings	$2.093B	$2.190B	$1.933B
YoY Change	8.66%	6.73%	6.91%
Common Stock	$2.542B	$2.529B	$2.527B
YoY Change	1.14%	1.07%	1.08%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$5.806M	$1.765M	$1.765M
YoY Change	70.71%	1565.09%	833.86%
Treasury Stock Shares	115.0K shares	53.56K shares	53.56K shares
Shareholders Equity	$4.584B	$4.654B	$4.393B
YoY Change
Total Liabilities & Shareholders Equity	$15.03B	$14.88B	$14.70B
YoY Change	5.17%	6.4%	7.39%

Cashflow Statement

Concept	2015 Q4	2015 Q3	2015 Q2
OPERATING ACTIVITIES
Net Income	$45.98M	$262.0M	$127.5M
YoY Change	382.2%	5.6%	-9.82%
Depreciation, Depletion And Amortization	$143.6M	$145.9M	$140.7M
YoY Change	15.06%	16.44%	13.47%
Cash From Operating Activities	$272.9M	$427.1M	$250.2M
YoY Change	28.3%	1.26%	15.89%
INVESTING ACTIVITIES
Capital Expenditures	-$297.4M	-$247.7M	-$280.0M
YoY Change	1.88%	7.74%	54.44%
Acquisitions
YoY Change
Other Investing Activities	$4.000M	-$15.60M	$3.300M
YoY Change	29.03%	43.12%	-203.13%
Cash From Investing Activities	-$293.4M	-$263.3M	-$276.7M
YoY Change	1.56%	9.34%	49.97%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	47.00M	-164.4M	28.50M
YoY Change	-35.88%	-8.51%	-122.67%
NET CHANGE
Cash From Operating Activities	272.9M	427.1M	250.2M
Cash From Investing Activities	-293.4M	-263.3M	-276.7M
Cash From Financing Activities	47.00M	-164.4M	28.50M
Net Change In Cash	26.50M	-600.0K	2.000M
YoY Change	-1013.79%	-146.15%	-102.12%
FREE CASH FLOW
Cash From Operating Activities	$272.9M	$427.1M	$250.2M
Capital Expenditures	-$297.4M	-$247.7M	-$280.0M
Free Cash Flow	$570.3M	$674.8M	$530.2M
YoY Change	13.02%	3.54%	33.48%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3037000	USD
CY2014	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	-15457000	USD
CY2015	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	-16259000	USD
CY2016	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	-19970000	USD
CY2016	pnw	Deferred Income Tax Expense Benefit Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations	226522000	USD
CY2015Q4	pnw	Deferred Tax Assets Credit And Loss Carryforwards DeferredTaxAssetsCreditAndLossCarryforwards	59557000	USD
CY2016Q4	pnw	Deferred Tax Assets Credit And Loss Carryforwards DeferredTaxAssetsCreditAndLossCarryforwards	75944000	USD
CY2015Q4	pnw	Deferred Tax Assets Regulatory Liabilities Asset Retirement Obligation And Removal Costs DeferredTaxAssetsRegulatoryLiabilitiesAssetRetirementObligationAndRemovalCosts	216765000	USD
CY2016Q4	pnw	Deferred Tax Assets Regulatory Liabilities Asset Retirement Obligation And Removal Costs DeferredTaxAssetsRegulatoryLiabilitiesAssetRetirementObligationAndRemovalCosts	200140000	USD
CY2015Q4	pnw	Deferred Tax Assets Regulatory Liabilities Other DeferredTaxAssetsRegulatoryLiabilitiesOther	60707000	USD
CY2016	dei	Amendment Flag AmendmentFlag	false
CY2016	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2016	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2016	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2016
CY2016	dei	Document Period End Date DocumentPeriodEndDate	2016-12-31
CY2016	dei	Document Type DocumentType	10-K
CY2016	dei	Entity Central Index Key EntityCentralIndexKey	0000764622
CY2017Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	111340169	shares
CY2016	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2016	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2016Q2	dei	Entity Public Float EntityPublicFloat	8961361256	USD
CY2016	dei	Entity Registrant Name EntityRegistrantName	PINNACLE WEST CAPITAL CORP
CY2016	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2016	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2015Q4	pnw	Accumulated Amortization On Nuclear Fuel AccumulatedAmortizationOnNuclearFuel	146228000	USD
CY2016Q4	pnw	Accumulated Amortization On Nuclear Fuel AccumulatedAmortizationOnNuclearFuel	147202000	USD
CY2014	pnw	Change In Margin And Collateral Accounts Liabilities ChangeInMarginAndCollateralAccountsLiabilities	-24975000	USD
CY2015	pnw	Change In Margin And Collateral Accounts Liabilities ChangeInMarginAndCollateralAccountsLiabilities	22776000	USD
CY2016	pnw	Change In Margin And Collateral Accounts Liabilities ChangeInMarginAndCollateralAccountsLiabilities	17735000	USD
CY2016	pnw	Clean Power Plan Optional Extension Period CleanPowerPlanOptionalExtensionPeriod	P2Y
CY2015Q4	pnw	Deferred Fuel And Purchased Power Regulatory Asset Current DeferredFuelAndPurchasedPowerRegulatoryAssetCurrent	0	USD
CY2016Q4	pnw	Deferred Fuel And Purchased Power Regulatory Asset Current DeferredFuelAndPurchasedPowerRegulatoryAssetCurrent	12465000	USD
CY2015Q4	pnw	Deferred Fueland Purchased Power Regulatory Liability Current DeferredFuelandPurchasedPowerRegulatoryLiabilityCurrent	9688000	USD
CY2016Q4	pnw	Deferred Fueland Purchased Power Regulatory Liability Current DeferredFuelandPurchasedPowerRegulatoryLiabilityCurrent	0	USD
CY2014	pnw	Deferred Income Tax Expense Benefit Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations	185269000	USD
CY2015	pnw	Deferred Income Tax Expense Benefit Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations	245292000	USD
CY2016Q4	pnw	Deferred Tax Assets Regulatory Liabilities Other DeferredTaxAssetsRegulatoryLiabilitiesOther	63311000	USD
CY2015Q4	pnw	Deferred Tax Assets Regulatory Liabilities Other Postretirement Benefits DeferredTaxAssetsRegulatoryLiabilitiesOtherPostretirementBenefits	83034000	USD
CY2016Q4	pnw	Deferred Tax Assets Regulatory Liabilities Other Postretirement Benefits DeferredTaxAssetsRegulatoryLiabilitiesOtherPostretirementBenefits	60375000	USD
CY2015Q4	pnw	Deferred Tax Assets Regulatory Liabilities Unamortized Investment Tax Credits DeferredTaxAssetsRegulatoryLiabilitiesUnamortizedInvestmentTaxCredits	100779000	USD
CY2016Q4	pnw	Deferred Tax Assets Regulatory Liabilities Unamortized Investment Tax Credits DeferredTaxAssetsRegulatoryLiabilitiesUnamortizedInvestmentTaxCredits	113195000	USD
CY2015Q4	pnw	Deferred Tax Assets Renewable Energy Incentives DeferredTaxAssetsRenewableEnergyIncentives	60956000	USD
CY2016Q4	pnw	Deferred Tax Assets Renewable Energy Incentives DeferredTaxAssetsRenewableEnergyIncentives	56379000	USD
CY2015Q4	pnw	Deferred Tax Liabilities Other Postretirement Assets DeferredTaxLiabilitiesOtherPostretirementAssets	71737000	USD
CY2016Q4	pnw	Deferred Tax Liabilities Other Postretirement Assets DeferredTaxLiabilitiesOtherPostretirementAssets	63477000	USD
CY2015Q4	pnw	Deferred Tax Liabilities Regulatory Assets Allowance For Equity Funds Used During Construction DeferredTaxLiabilitiesRegulatoryAssetsAllowanceForEquityFundsUsedDuringConstruction	54110000	USD
	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P4Y
CY2016Q4	pnw	Deferred Tax Liabilities Regulatory Assets Allowance For Equity Funds Used During Construction DeferredTaxLiabilitiesRegulatoryAssetsAllowanceForEquityFundsUsedDuringConstruction	61088000	USD
CY2015Q4	pnw	Deferred Tax Liabilities Regulatory Assets Deferred Fuel And Purchased Power Mark To Market DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPowerMarkToMarket	55020000	USD
CY2016Q4	pnw	Deferred Tax Liabilities Regulatory Assets Deferred Fuel And Purchased Power Mark To Market DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPowerMarkToMarket	21396000	USD
CY2015Q4	pnw	Deferred Tax Liabilities Regulatory Assets Other DeferredTaxLiabilitiesRegulatoryAssetsOther	108441000	USD
CY2016Q4	pnw	Deferred Tax Liabilities Regulatory Assets Other DeferredTaxLiabilitiesRegulatoryAssetsOther	123987000	USD
CY2015Q4	pnw	Deferred Tax Liabilities Regulatory Assets Pension And Other Postretirement Benefits DeferredTaxLiabilitiesRegulatoryAssetsPensionAndOtherPostretirementBenefits	240692000	USD
CY2016Q4	pnw	Deferred Tax Liabilities Regulatory Assets Pension And Other Postretirement Benefits DeferredTaxLiabilitiesRegulatoryAssetsPensionAndOtherPostretirementBenefits	274184000	USD
CY2015Q4	pnw	Deferred Tax Liabilities Regulatory Assets Retired Power Plan Costs DeferredTaxLiabilitiesRegulatoryAssetsRetiredPowerPlanCosts	53420000	USD
CY2016Q4	pnw	Deferred Tax Liabilities Regulatory Assets Retired Power Plan Costs DeferredTaxLiabilitiesRegulatoryAssetsRetiredPowerPlanCosts	49166000	USD
CY2016Q4	pnw	Defined Benefit Plan Amountof Other Postretirement Benefit Trust Assetsfor Union Employee Medical Costs DefinedBenefitPlanAmountofOtherPostretirementBenefitTrustAssetsforUnionEmployeeMedicalCosts	140000000	USD
CY2011	pnw	Defined Benefit Plan Cost Deferred DefinedBenefitPlanCostDeferred	11000000	USD
CY2012	pnw	Defined Benefit Plan Cost Deferred DefinedBenefitPlanCostDeferred	14000000	USD
CY2015	pnw	Defined Benefit Plan Mortality Assumptions Impacton Pensionand Other Postretirement Obligations DefinedBenefitPlanMortalityAssumptionsImpactonPensionandOtherPostretirementObligations	67000000	USD
CY2016	pnw	Defined Benefit Plan Partnership Funding Commitments Funded Amount DefinedBenefitPlanPartnershipFundingCommitmentsFundedAmount	54000000	USD
CY2016Q4	pnw	Defined Benefit Plan Partnership Funding Commitments Maximum Contribution Amount DefinedBenefitPlanPartnershipFundingCommitmentsMaximumContributionAmount	75000000	USD
	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
CY2015	pnw	Defined Benefit Plan Post65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPost65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0500
CY2016	pnw	Defined Benefit Plan Post65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPost65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0500
CY2015	pnw	Defined Benefit Plan Post65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Obligation DefinedBenefitPlanPost65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitObligation	0.0500
CY2016	pnw	Defined Benefit Plan Post65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Obligation DefinedBenefitPlanPost65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitObligation	0.0500
	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
CY2015	pnw	Defined Benefit Plan Post65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPost65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P0Y
CY2016	pnw	Defined Benefit Plan Post65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPost65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P0Y
CY2015	pnw	Defined Benefit Plan Post65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanPost65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitObligations	P0Y
CY2016	pnw	Defined Benefit Plan Post65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanPost65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitObligations	P0Y
	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
CY2015	pnw	Defined Benefit Plan Pre65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPre65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0700
CY2016	pnw	Defined Benefit Plan Pre65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPre65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0700
CY2015	pnw	Defined Benefit Plan Pre65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Obligation DefinedBenefitPlanPre65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitObligation	0.0700
CY2016	pnw	Defined Benefit Plan Pre65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Obligation DefinedBenefitPlanPre65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitObligation	0.0700
CY2014Q4	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P4Y
CY2015	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P4Y
CY2016	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P4Y
CY2015	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitObligations	P4Y
CY2016	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitObligations	P4Y
CY2015	pnw	Defined Benefit Plan Ultimate Health Care Cost Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanUltimateHealthCareCostTrendRateusedinCalculatingBenefitObligations	0.0500
CY2016	pnw	Defined Benefit Plan Ultimate Health Care Cost Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanUltimateHealthCareCostTrendRateusedinCalculatingBenefitObligations	0.0500
CY2016	pnw	Fair Value Measurement Inter Level Transfers Amount FairValueMeasurementInterLevelTransfersAmount	0	USD
CY2015	pnw	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Derivative Gain Loss Deferred As Regulatory Asset Or Liability FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDerivativeGainLossDeferredAsRegulatoryAssetOrLiability	-4009000	USD
CY2016	pnw	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Derivative Gain Loss Deferred As Regulatory Asset Or Liability FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDerivativeGainLossDeferredAsRegulatoryAssetOrLiability	-37543000	USD
CY2016	pnw	Income Tax Percentage Likelihood Largest Tax Benefit Amountis Realized IncomeTaxPercentageLikelihoodLargestTaxBenefitAmountisRealized	0.5
CY2014	pnw	Income Tax Reconciliation Allowance For Equity Funds Used During Construction IncomeTaxReconciliationAllowanceForEquityFundsUsedDuringConstruction	8523000	USD
CY2015	pnw	Income Tax Reconciliation Allowance For Equity Funds Used During Construction IncomeTaxReconciliationAllowanceForEquityFundsUsedDuringConstruction	9711000	USD
CY2016	pnw	Income Tax Reconciliation Allowance For Equity Funds Used During Construction IncomeTaxReconciliationAllowanceForEquityFundsUsedDuringConstruction	11724000	USD
CY2014	pnw	Income Tax Reconciliation Tax Credits And Adjustments Prior Years IncomeTaxReconciliationTaxCreditsAndAdjustmentsPriorYears	0	USD
CY2015	pnw	Income Tax Reconciliation Tax Credits And Adjustments Prior Years IncomeTaxReconciliationTaxCreditsAndAdjustmentsPriorYears	2169000	USD
CY2016	pnw	Income Tax Reconciliation Tax Credits And Adjustments Prior Years IncomeTaxReconciliationTaxCreditsAndAdjustmentsPriorYears	0	USD
CY2014	pnw	Increase Decrease Deferred Fuel And Purchased Power Amortization IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization	40757000	USD
CY2015	pnw	Increase Decrease Deferred Fuel And Purchased Power Amortization IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization	1617000	USD
CY2016	pnw	Increase Decrease Deferred Fuel And Purchased Power Amortization IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization	38152000	USD
CY2016	pnw	Increase Decrease In Deferred Income Taxes Due To Regulation Adoption IncreaseDecreaseInDeferredIncomeTaxesDueToRegulationAdoption	-27000000	USD
CY2014	pnw	Miscellaneous Other Nonoperating Expense MiscellaneousOtherNonoperatingExpense	2663000	USD
CY2015	pnw	Miscellaneous Other Nonoperating Expense MiscellaneousOtherNonoperatingExpense	4451000	USD
CY2016	pnw	Miscellaneous Other Nonoperating Expense MiscellaneousOtherNonoperatingExpense	4355000	USD
CY2014	pnw	Miscellaneous Other Nonoperating Income MiscellaneousOtherNonoperatingIncome	212000	USD
CY2015	pnw	Miscellaneous Other Nonoperating Income MiscellaneousOtherNonoperatingIncome	128000	USD
CY2016	pnw	Miscellaneous Other Nonoperating Income MiscellaneousOtherNonoperatingIncome	17000	USD
CY2014	pnw	Nonoperating Costs NonoperatingCosts	9657000	USD
CY2015	pnw	Nonoperating Costs NonoperatingCosts	11292000	USD
CY2016	pnw	Nonoperating Costs NonoperatingCosts	9235000	USD
CY2016	pnw	Number Of Non Financial Separate Performance Metrics Based On Which Awards Vest NumberOfNonFinancialSeparatePerformanceMetricsBasedOnWhichAwardsVest	6	non_financial_seperate_performance_metric
CY2015Q4	pnw	Regulatory Asset Including Deferred Fuel And Purchased Power Regulatory Asset Current RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent	149555000	USD
CY2016Q4	pnw	Regulatory Asset Including Deferred Fuel And Purchased Power Regulatory Asset Current RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent	106875000	USD
CY2015Q4	pnw	Regulatory Liability Including Deferred Fuel And Purchased Power Regulatory Liability Current RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent	145766000	USD
CY2016Q4	pnw	Regulatory Liability Including Deferred Fuel And Purchased Power Regulatory Liability Current RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent	99899000	USD
CY2016	pnw	Share Based Compensation Arrangement By Share Based Payment Award Number Of Performance Elements Criteria ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPerformanceElementsCriteria	2	performance_criteria
CY2015Q4	pnw	Total Deferred Debits TotalDeferredDebits	1528978000	USD
CY2016Q4	pnw	Total Deferred Debits TotalDeferredDebits	1619108000	USD
CY2015Q4	pnw	Total Investments And Other Assets TotalInvestmentsAndOtherAssets	799820000	USD
CY2016Q4	pnw	Total Investments And Other Assets TotalInvestmentsAndOtherAssets	848650000	USD
CY2016Q4	pnw	Unrecognized Tax Benefits Interest On Income Taxes Receivable UnrecognizedTaxBenefitsInterestOnIncomeTaxesReceivable	1000000	USD
CY2015Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	297480000	USD
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	264631000	USD
CY2015Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	274691000	USD
CY2016Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	250491000	USD
CY2015Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	187080000	USD
CY2016Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	210162000	USD
CY2015Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	5594094000	USD
CY2016Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	5970100000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-7155000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-4752000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	37593000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	39070000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-44748000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-43822000	USD
CY2014	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	33000000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	19000000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	19000000	USD
CY2015Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	3125000	USD
CY2015	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	58000000	USD
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	58000000	USD
CY2014	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	53000000	USD
CY2015Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	111095402	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	111392053	shares
CY2015Q4	us-gaap	Common Stock Value CommonStockValue	2541668000	USD
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	2596030000	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
CY2015	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	5000000	USD
CY2015Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	28573000	USD
CY2016Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	9135000	USD
CY2015Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	415003000	USD
CY2016Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	615340000	USD
CY2015Q4	us-gaap	Assets Assets	15028258000	USD
CY2016Q4	us-gaap	Assets Assets	16004253000	USD
CY2015Q4	us-gaap	Assets Current AssetsCurrent	890516000	USD
CY2016Q4	us-gaap	Assets Current AssetsCurrent	822219000	USD
CY2015Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	30364000	USD
CY2016Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	11076000	USD
CY2014	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	44712000	USD
CY2015	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	83798000	USD
CY2016	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	114855000	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
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	39488000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	8881000	USD
CY2014	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-1922000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	31884000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-30607000	USD
CY2015Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2016Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2014	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.33
CY2015	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.44
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.56
CY2015Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2016Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2015Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	150000000	shares
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	150000000	shares
CY2015Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	2535862000	USD
CY2016Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	2591897000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	407507000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	460650000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	442960000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	433608000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	479583000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	462453000	USD
CY2015Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	816307000	USD
CY2016Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	1019947000	USD
CY2014	us-gaap	Cost Of Goods Sold Electric CostOfGoodsSoldElectric	1179829000	USD
CY2015	us-gaap	Cost Of Goods Sold Electric CostOfGoodsSoldElectric	1101298000	USD
CY2016	us-gaap	Cost Of Goods Sold Electric CostOfGoodsSoldElectric	1075510000	USD
CY2014	us-gaap	Cost Of Services Depreciation CostOfServicesDepreciation	396000000	USD
CY2015	us-gaap	Cost Of Services Depreciation CostOfServicesDepreciation	430000000	USD
CY2016	us-gaap	Cost Of Services Depreciation CostOfServicesDepreciation	422000000	USD
CY2014	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	417358000	USD
CY2015	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	494422000	USD
CY2016	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	485829000	USD
CY2014	us-gaap	Costs And Expenses CostsAndExpenses	2680390000	USD
CY2015	us-gaap	Costs And Expenses CostsAndExpenses	2640841000	USD
CY2016	us-gaap	Costs And Expenses CostsAndExpenses	2642698000	USD
CY2015Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	96240000	USD
CY2016Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	107949000	USD
CY2015Q4	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	45855000	USD
CY2014	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	25054000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-12335000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	8630000	USD
CY2014	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	35436000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-7572000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	9889000	USD
CY2014	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	10382000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	4763000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1259000	USD
CY2015Q4	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	115609000	USD
CY2016Q4	us-gaap	Customer Advances For Construction CustomerAdvancesForConstruction	88672000	USD
CY2015Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	73073000	USD
CY2016Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	82520000	USD
CY2015Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	3819971000	USD
CY2016Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	4146785000	USD
CY2015Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	735196000	USD
CY2016Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	779586000	USD
CY2015Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	5404093000	USD
CY2016Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	5753610000	USD
CY2014	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	167365000	USD
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	221505000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	201743000	USD
CY2014	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	159023000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	236819000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	206870000	USD
CY2015Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	3715782000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	3904047000	USD
CY2014	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	17904000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	23787000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	24779000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	70498000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	26614000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	992357000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	958815000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	5000000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	149033000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	158421000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards General Business DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness	98000000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	191028000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	204436000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	2723425000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	2945232000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	10626000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	7594000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	2723425000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	2945232000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	4984000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	5166000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	3116752000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	3297989000	USD
CY2015Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	480998000	USD
CY2016Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	509310000	USD
CY2015Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	185997000	USD
CY2016Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	166206000	USD
CY2015Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.0400
CY2016Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.0400
	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
CY2015	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate DefinedBenefitPlanUltimateHealthCareCostTrendRate	0.0500
CY2016	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate DefinedBenefitPlanUltimateHealthCareCostTrendRate	0.0500
CY2014	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	496487000	USD
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	571664000	USD
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	565011000	USD
CY2015Q4	us-gaap	Derivative Instruments And Hedges DerivativeInstrumentsAndHedges	15905000	USD
CY2016Q4	us-gaap	Derivative Instruments And Hedges DerivativeInstrumentsAndHedges	19694000	USD
CY2015Q4	us-gaap	Derivative Instruments And Hedges Liabilities DerivativeInstrumentsAndHedgesLiabilities	77716000	USD
CY2016Q4	us-gaap	Derivative Instruments And Hedges Liabilities DerivativeInstrumentsAndHedgesLiabilities	25836000	USD
CY2015Q4	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	12106000	USD
CY2016Q4	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	1000	USD
CY2015Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	89973000	USD
CY2016Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	47238000	USD
CY2014	us-gaap	Dividends Common Stock DividendsCommonStock	256803000	USD
CY2015	us-gaap	Dividends Common Stock DividendsCommonStock	270519000	USD
CY2016	us-gaap	Dividends Common Stock DividendsCommonStock	284765000	USD
CY2015Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	69363000	USD
CY2016Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	72926000	USD
CY2014Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	65790000	USD
CY2015Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	69363000	USD
CY2016Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	72926000	USD
CY2014	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.59
CY2015Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.15
CY2015Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.11
CY2015Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.32
CY2015Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.37
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.94
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.04
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.09
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.36
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.97
CY2014	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.58
CY2015Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.14
CY2015Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.10
CY2015Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.30
CY2015Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.37
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.92
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.04
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.08
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.35
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.47
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.95
CY2014	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2016Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	13000000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y
CY2014	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	13000000	USD
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	7000000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	10000000	USD
CY2015Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	45697000	USD
CY2016Q4	us-gaap	Energy Related Inventory Other Fossil Fuel EnergyRelatedInventoryOtherFossilFuel	28608000	USD
CY2015	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss	-452000	USD
CY2016	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss	88000	USD
CY2015	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Change In Unrealized Gain Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	0	USD
CY2016	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Change In Unrealized Gain Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	0	USD
CY2015	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	0	USD
CY2016	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	0	USD
CY2015	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements	-14809000	USD
CY2016	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements	-15146000	USD
CY2015	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Into Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3	-6256000	USD
CY2016	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Into Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3	1900000	USD
CY2015	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	-4315000	USD
CY2016	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	-5982000	USD
CY2014Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	-41386000	USD
CY2015Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	-32979000	USD
CY2016Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	-47406000	USD
CY2015Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	546038000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	603637000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	41000000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	1000000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	4000000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	12000000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	23000000	USD
CY2016	us-gaap	Finite Lived Intangible Assets Remaining Amortization Period1 FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1	P6Y
CY2014	us-gaap	Gain Loss On Investments GainLossOnInvestments	8386000	USD
CY2014	us-gaap	Income Loss Including Portion Attributable To Noncontrolling Interest IncomeLossIncludingPortionAttributableToNoncontrollingInterest	644401000	USD
CY2015	us-gaap	Income Loss Including Portion Attributable To Noncontrolling Interest IncomeLossIncludingPortionAttributableToNoncontrollingInterest	693910000	USD
CY2016	us-gaap	Income Loss Including Portion Attributable To Noncontrolling Interest IncomeLossIncludingPortionAttributableToNoncontrollingInterest	697938000	USD
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	220705000	USD
CY2015Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7947000	USD
CY2015Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	67371000	USD
CY2015Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	139555000	USD
CY2015Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22847000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	237720000	USD
CY2016Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1914000	USD
CY2016Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	65742000	USD
CY2016Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	141446000	USD
CY2016Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	27309000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	236411000	USD
CY2014	us-gaap	Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy	-830000	USD
CY2015	us-gaap	Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy	-837000	USD
CY2016	us-gaap	Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy	-844000	USD
CY2014	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	225540000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	242869000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	244278000	USD
CY2014	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	9135000	USD
CY2015	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	6626000	USD
CY2016	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	6823000	USD
CY2014	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1228000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-218000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-588000	USD
CY2014	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	18149000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	18265000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	16311000	USD
CY2014	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	4928000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	5527000	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	5887000	USD
CY2014	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-102154000	USD
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	6550000	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	9956000	USD
CY2015Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	589000	USD
CY2015	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-2013000	USD
CY2016	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	447000	USD
CY2014	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	343000	USD
CY2015	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	324000	USD
CY2016	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	-673000	USD
CY2014	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-132419000	USD
CY2015	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-2509000	USD
CY2016	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	3162000	USD
CY2016Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	3751000	USD
CY2014	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-353000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-34266000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-66917000	USD
CY2014	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	9615000	USD
CY2014	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-3724000	USD
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	23945000	USD
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	1491000	USD
CY2014	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	17892000	USD
CY2015	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	603000	USD
CY2016	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	29594000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	56561000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-2426000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	60163000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-114052000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-100715000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-82793000	USD
CY2014	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-4384000	USD
CY2015	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-3145000	USD
CY2016	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	23324000	USD
CY2014	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	52672000	USD
CY2015	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	22219000	USD
CY2016	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	2489000	USD
CY2014	us-gaap	Increase Decrease In Regulatory Clause Revenue IncreaseDecreaseInRegulatoryClauseRevenue	-26927000	USD
CY2015	us-gaap	Increase Decrease In Regulatory Clause Revenue IncreaseDecreaseInRegulatoryClauseRevenue	14997000	USD
CY2016	us-gaap	Increase Decrease In Regulatory Clause Revenue IncreaseDecreaseInRegulatoryClauseRevenue	-60303000	USD
CY2014	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	59618000	USD
CY2015	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	-20535000	USD
CY2016	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	14682000	USD
CY2014	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	3737000	USD
CY2015	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	-4293000	USD
CY2016	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	11709000	USD
CY2015Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	123975000	USD
CY2016Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	90022000	USD
CY2014	us-gaap	Interest Costs Incurred InterestCostsIncurred	200950000	USD
CY2015	us-gaap	Interest Costs Incurred InterestCostsIncurred	194964000	USD
CY2016	us-gaap	Interest Costs Incurred InterestCostsIncurred	205720000	USD
CY2014	us-gaap	Interest Expense InterestExpense	185493000	USD
CY2015	us-gaap	Interest Expense InterestExpense	178705000	USD
CY2016	us-gaap	Interest Expense InterestExpense	185750000	USD
CY2014	us-gaap	Interest Paid Net InterestPaidNet	177074000	USD
CY2015	us-gaap	Interest Paid Net InterestPaidNet	170209000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	184462000	USD
CY2015Q4	us-gaap	Interest Payable Current InterestPayableCurrent	56305000	USD
CY2016Q4	us-gaap	Interest Payable Current InterestPayableCurrent	52835000	USD
CY2014	us-gaap	Investment Income Interest InvestmentIncomeInterest	1010000	USD
CY2015	us-gaap	Investment Income Interest InvestmentIncomeInterest	493000	USD
CY2016	us-gaap	Investment Income Interest InvestmentIncomeInterest	884000	USD
CY2014	us-gaap	Investment Tax Credit InvestmentTaxCredit	26246000	USD
CY2015	us-gaap	Investment Tax Credit InvestmentTaxCredit	8473000	USD
CY2016	us-gaap	Investment Tax Credit InvestmentTaxCredit	23082000	USD
CY2014	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	18000000	USD
CY2015	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	17000000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	16000000	USD
CY2015Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	15028258000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	16004253000	USD
CY2015Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1442317000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1292946000	USD
CY2015Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	63343000	USD
CY2016Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	58482000	USD
CY2015Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	9524000	USD
CY2016Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	10046000	USD
CY2015Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	4106367000	USD
CY2016Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	4425789000	USD
CY2015Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	3462391000	USD
CY2016Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	4021785000	USD
CY2014	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	9426000	USD
CY2015	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	2080000	USD
CY2016	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	1747000	USD
CY2015Q4	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	201984000	USD
CY2016Q4	us-gaap	Mine Reclamation And Closing Liability Noncurrent MineReclamationAndClosingLiabilityNoncurrent	221910000	USD
CY2015Q4	us-gaap	Minority Interest MinorityInterest	135540000	USD
CY2016Q4	us-gaap	Minority Interest MinorityInterest	132290000	USD
CY2014	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	20482000	USD
CY2015	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	35002000	USD
CY2016	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	22743000	USD
CY2014	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-178881000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	3790000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	198081000	USD
CY2014	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-922668000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1066233000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1252078000	USD
CY2014	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1099627000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1094327000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1023390000	USD
CY2016	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	19493000	USD
CY2014	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	397595000	USD
CY2014	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	26101000	USD
CY2015	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	18933000	USD
CY2015Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	16122000	USD
CY2015Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	122902000	USD
CY2015Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	257116000	USD
CY2015Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	41117000	USD
CY2016Q4	us-gaap	Nuclear Fuel Net Of Amortization NuclearFuelNetOfAmortization	119004000	USD
CY2014	us-gaap	Operating Income Loss OperatingIncomeLoss	811242000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	437257000	USD
CY2015Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	67684000	USD
CY2015Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	231973000	USD
CY2015Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	445111000	USD
CY2015Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	109834000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	854602000	USD
CY2016Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	50162000	USD
CY2016Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	4453000	USD
CY2016Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	121308000	USD
CY2016Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	231748000	USD
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	451258000	USD
CY2016Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	263027000	USD
CY2016Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	53246000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	442034000	USD
CY2014	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	18652000	USD
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	18013000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	27704000	USD
CY2015Q4	us-gaap	Nuclear Fuel Net Of Amortization NuclearFuelNetOfAmortization	123139000	USD
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	122816000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	855984000	USD
CY2015Q4	us-gaap	Other Assets Current OtherAssetsCurrent	37242000	USD
CY2016Q4	us-gaap	Other Assets Current OtherAssetsCurrent	45028000	USD
CY2015Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	52518000	USD
CY2016Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	69063000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	9912000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	23393000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	926000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	2761000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-20163000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	1477000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	1307000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-13302000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	633000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-13483000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-4187000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-2941000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-7932000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-1801000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-985000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-810000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-957000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-538000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	438000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	342000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	585000	USD
CY2014	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	2883000	USD
CY2015	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	4932000	USD
CY2016	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	3541000	USD
CY2015Q4	us-gaap	Other Deferred Costs Net OtherDeferredCostsNet	128835000	USD
CY2016Q4	us-gaap	Other Deferred Costs Net OtherDeferredCostsNet	139474000	USD
CY2015Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	234234000	USD
CY2016Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	253979000	USD
CY2015Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	197861000	USD
CY2016Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	244000000	USD
CY2015Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	186345000	USD
CY2016Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	156784000	USD
CY2015Q4	us-gaap	Other Long Term Debt Current OtherLongTermDebtCurrent	357580000	USD
CY2016Q4	us-gaap	Other Long Term Debt Current OtherLongTermDebtCurrent	125000000	USD
CY2014	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	21746000	USD
CY2015	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	17823000	USD
CY2016	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	15337000	USD
CY2014	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	9608000	USD
CY2015	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	621000	USD
CY2016	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	901000	USD
CY2014	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-347000	USD
CY2015	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	3184000	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	18651000	USD
CY2014	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	246671000	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	260027000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	274229000	USD
CY2014	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	910634000	USD
CY2015	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1076087000	USD
CY2016	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1275472000	USD
CY2014	us-gaap	Payments To Invest In Decommissioning Fund PaymentsToInvestInDecommissioningFund	373444000	USD
CY2015	us-gaap	Payments To Invest In Decommissioning Fund PaymentsToInvestInDecommissioningFund	496062000	USD
CY2016	us-gaap	Payments To Invest In Decommissioning Fund PaymentsToInvestInDecommissioningFund	635691000	USD
CY2014	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	20482000	USD
CY2015	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	35002000	USD
CY2016	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	22744000	USD
CY2014	us-gaap	Proceeds From Contribution In Aid Of Construction ProceedsFromContributionInAidOfConstruction	20325000	USD
CY2015	us-gaap	Proceeds From Contribution In Aid Of Construction ProceedsFromContributionInAidOfConstruction	46546000	USD
CY2016	us-gaap	Proceeds From Contribution In Aid Of Construction ProceedsFromContributionInAidOfConstruction	64296000	USD
CY2014	us-gaap	Proceeds From Decommissioning Fund ProceedsFromDecommissioningFund	356195000	USD
CY2016Q3	us-gaap	Profit Loss ProfitLoss	267900000	USD
CY2016Q4	us-gaap	Profit Loss ProfitLoss	58119000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	461527000	USD
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CY2016	us-gaap	Proceeds From Decommissioning Fund ProceedsFromDecommissioningFund	633410000	USD
CY2014	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	15288000	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	19373000	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-4867000	USD
CY2014	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	731126000	USD
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	842415000	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	693151000	USD
CY2014	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	0	USD
CY2015	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	0	USD
CY2016	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	40000000	USD
CY2014	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	161000	USD
CY2015	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	1000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2014	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-5725000	USD
CY2015	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-147400000	USD
CY2016	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	137200000	USD
CY2014	us-gaap	Profit Loss ProfitLoss	423696000	USD
CY2015Q1	us-gaap	Profit Loss ProfitLoss	20727000	USD
CY2015Q2	us-gaap	Profit Loss ProfitLoss	127507000	USD
CY2015Q3	us-gaap	Profit Loss ProfitLoss	261978000	USD
CY2015Q4	us-gaap	Profit Loss ProfitLoss	45978000	USD
CY2015	us-gaap	Profit Loss ProfitLoss	456190000	USD
CY2016Q1	us-gaap	Profit Loss ProfitLoss	9326000	USD
CY2016Q2	us-gaap	Profit Loss ProfitLoss	126182000	USD
CY2015Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	16222232000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	17341888000	USD
CY2015Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10628138000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	11371788000	USD
CY2014	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	15457000	USD
CY2015	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	16259000	USD
CY2016	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	19970000	USD
CY2014	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	30790000	USD
CY2015	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	35215000	USD
CY2016	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	42140000	USD
CY2014	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.0847
CY2015	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.0802
CY2016	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.0717
CY2014	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0277
CY2015	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0274
CY2016	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0266
CY2015Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	11808944000	USD
CY2015Q3	us-gaap	Sales Revenue Net SalesRevenueNet	1199146000	USD
CY2015Q4	us-gaap	Sales Revenue Net SalesRevenueNet	734430000	USD
CY2015	us-gaap	Sales Revenue Net SalesRevenueNet	3495443000	USD
CY2016Q1	us-gaap	Sales Revenue Net SalesRevenueNet	677167000	USD
CY2016Q2	us-gaap	Sales Revenue Net SalesRevenueNet	915394000	USD
CY2016Q3	us-gaap	Sales Revenue Net SalesRevenueNet	1166922000	USD
CY2016Q4	us-gaap	Sales Revenue Net SalesRevenueNet	739199000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	12714276000	USD
CY2012Q3	us-gaap	Regulatory Asset Amortization Period RegulatoryAssetAmortizationPeriod	P3Y
CY2015Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	149555000	USD
CY2016Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	94410000	USD
CY2015Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1214146000	USD
CY2016Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1313428000	USD
CY2015Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	136078000	USD
CY2016Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	99899000	USD
CY2015Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	994152000	USD
CY2016Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	948916000	USD
CY2014	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	652578000	USD
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	415570000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	370430000	USD
CY2015Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2092803000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2255547000	USD
CY2015Q4	us-gaap	Sale Leaseback Transaction Accumulated Depreciation SaleLeasebackTransactionAccumulatedDepreciation	233665000	USD
CY2016Q4	us-gaap	Sale Leaseback Transaction Accumulated Depreciation SaleLeasebackTransactionAccumulatedDepreciation	237535000	USD
CY2014	us-gaap	Sales Revenue Net SalesRevenueNet	3491632000	USD
CY2015Q1	us-gaap	Sales Revenue Net SalesRevenueNet	671219000	USD
CY2015Q2	us-gaap	Sales Revenue Net SalesRevenueNet	890648000	USD
CY2016	us-gaap	Sales Revenue Net SalesRevenueNet	3498682000	USD
CY2014	us-gaap	Share Based Compensation ShareBasedCompensation	33059000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	18756000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	18883000	USD
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Requisite Service Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1	P3Y
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	22000000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	21000000	USD
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	22000000	USD
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	2500000	shares
CY2015Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	0	USD
CY2016Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	177200000	USD
CY2014	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	21412000	USD
CY2015	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	28698000	USD
CY2016	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	13982000	USD
CY2014	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	8800000	USD
CY2015	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	7731000	USD
CY2016	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	10760000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	4583917000	USD
CY2014	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-339000	USD
CY2015	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	381000	USD
CY2016	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	403000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	4803622000	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
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4719457000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4935912000	USD
CY2014	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	172295000	USD
CY2015	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	171812000	USD
CY2016	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	166499000	USD
CY2015Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	138600000	USD
CY2016Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	138964000	USD
CY2015Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	115030	shares
CY2016Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	55317	shares
CY2015Q4	us-gaap	Treasury Stock Value TreasuryStockValue	5806000	USD
CY2016Q4	us-gaap	Treasury Stock Value TreasuryStockValue	4133000	USD
CY2014	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	7893000	USD
CY2015	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	10136000	USD
CY2016	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	9087000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	41997000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	44775000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	34447000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	36075000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	2282000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	10244000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1953000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	4309000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2175000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2695000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	751000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	886000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	965000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	804000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	1333000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	752000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	-161000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	529000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	2778000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	-10328000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	1628000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2015	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2259000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	11207000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	9523000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	11313000	USD
CY2014	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	908025000	USD
CY2015Q1	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	214944000	USD
CY2015Q2	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	210965000	USD
CY2015Q3	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	220449000	USD
CY2015Q4	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	222019000	USD
CY2015	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	868377000	USD
CY2016Q1	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	243195000	USD
CY2016Q2	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	242279000	USD
CY2016Q3	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	217568000	USD
CY2016Q4	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	208277000	USD
CY2016	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	911319000	USD
CY2015Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	117385000	USD
CY2016Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	113515000	USD
CY2014	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	111178000	shares
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	111552000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	112046000	shares
CY2014	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110626000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	111026000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	111409000	shares
CY2014	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	552000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	526000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	637000	shares
CY2016	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;">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 style="line-height:120%;text-align:center;font-size:11.5pt;"><font style="font-family:inherit;font-size:11.5pt;"><br clear="none"/></font></div></div>
CY2016	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 style="line-height:120%;text-align:center;font-size:11.5pt;"><font style="font-family:inherit;font-size:11.5pt;"><br clear="none"/></font></div></div>

Files In Submission

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$PNW
PINNACLE WEST CAPITAL CORP Stock $pnw

2015 Q4 Form 10-K Financial Statement

#000076462217000010 Filed on February 24, 2017

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$PNW PINNACLE WEST CAPITAL CORP Stock $pnw

2015 Q4 Form 10-K Financial Statement

#000076462217000010 Filed on February 24, 2017

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$PNW
PINNACLE WEST CAPITAL CORP Stock $pnw