$PNW
PINNACLE WEST CAPITAL CORP Stock $pnw

$pnw Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000076462220000017 Filed on February 21, 2020

Income Statement

Concept	2019 Q4	2018 Q4	2018 Q3
Revenue	$670.4M	$756.4M	$1.268B
YoY Change	-11.37%	-0.43%	7.16%
Cost Of Revenue			$389.9M
YoY Change			25.6%
Gross Profit			$878.1M
YoY Change			0.6%
Gross Profit Margin			69.25%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$163.3M	$161.1M	$164.3M
YoY Change	1.37%	-2.3%	6.41%
% of Gross Profit			18.71%
Operating Expenses	$673.6M	$728.9M	$839.0M
YoY Change	-7.59%	12.09%	16.9%
Operating Profit	$12.00M	$66.88M	$433.3M
YoY Change	-82.06%	-21.82%	-5.71%
Interest Expense	-$31.50M	-$1.400M	$55.69M
YoY Change	2150.0%	-97.73%	12.18%
% of Operating Profit	-262.57%	-2.09%	12.85%
Other Income/Expense, Net	$15.00M	$11.70M	$26.60M
YoY Change	28.21%	-3025.0%	73.2%
Pretax Income	-$19.70M	$37.70M	$404.2M
YoY Change	-152.25%	-20.3%	-4.95%
Income Tax	-$88.54M	$6.795M	$84.33M
% Of Pretax Income		18.02%	20.86%
Net Earnings	$68.85M	$30.95M	$319.9M
YoY Change	122.48%	16.78%	13.86%
Net Earnings / Revenue	10.27%	4.09%	25.23%
Basic Earnings Per Share	$0.57	$0.23	$2.81
Diluted Earnings Per Share	$0.57	$0.23	$2.80
COMMON SHARES
Basic Shares Outstanding	112.4M shares	112.1M shares	112.1M shares
Diluted Shares Outstanding			112.5M shares

Balance Sheet

Concept	2019 Q4	2018 Q4	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$10.00M	$6.000M	$65.00M
YoY Change	66.67%	-57.14%	490.91%
Cash & Equivalents	$10.28M	$5.766M	$64.99M
Short-Term Investments
Other Short-Term Assets	$61.96M	$56.13M	$60.95M
YoY Change	10.39%	16.84%	32.77%
Inventory	$346.0M	$294.0M	$309.0M
Prepaid Expenses
Receivables	$258.0M	$264.0M	$365.0M
Other Receivables	$22.00M	$0.00	$0.00
Total Short-Term Assets	$1.030B	$925.0M	$1.207B
YoY Change	11.36%	-8.98%	2.81%
LONG-TERM ASSETS
Property, Plant & Equipment	$13.20B	$12.37B	$12.12B
YoY Change	6.69%	6.01%	7.47%
Goodwill
YoY Change
Intangibles	$290.6M	$262.9M	$268.6M
YoY Change	10.52%	2.22%	4.85%
Long-Term Investments
YoY Change
Other Assets	$96.95M	$103.2M	$107.0M
YoY Change	-6.1%	98.4%	20.46%
Total Long-Term Assets	$17.45B	$16.74B	$16.46B
YoY Change	4.24%	4.6%	4.18%
TOTAL ASSETS
Total Short-Term Assets	$1.030B	$925.0M	$1.207B
Total Long-Term Assets	$17.45B	$16.74B	$16.46B
Total Assets	$18.48B	$17.66B	$17.67B
YoY Change	4.61%	3.79%	4.09%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$346.4M	$277.3M	$249.1M
YoY Change	24.92%	8.15%	5.2%
Accrued Expenses	$66.00M	$61.00M	$53.00M
YoY Change	8.2%	8.93%	8.16%
Deferred Revenue	$64.91M	$91.17M	$89.92M
YoY Change	-28.81%	29.53%
Short-Term Debt	$114.7M	$76.40M	$128.2M
YoY Change	50.1%	-19.92%	-2.44%
Long-Term Debt Due	$800.0M	$500.0M	$600.0M
YoY Change	60.0%	509.76%	189.86%
Total Short-Term Liabilities	$2.078B	$1.649B	$1.735B
YoY Change	26.04%	37.66%	33.12%
LONG-TERM LIABILITIES
Long-Term Debt	$4.833B	$4.638B	$4.487B
YoY Change	4.19%	-3.16%	-0.08%
Other Long-Term Liabilities	$159.8M	$147.6M	$161.5M
YoY Change	8.27%	-0.85%	1.96%
Total Long-Term Liabilities	$4.992B	$4.786B	$4.649B
YoY Change	4.32%	-3.09%	-0.01%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.078B	$1.649B	$1.735B
Total Long-Term Liabilities	$4.992B	$4.786B	$4.649B
Total Liabilities	$7.071B	$6.435B	$6.384B
YoY Change	9.88%	4.86%	7.24%
SHAREHOLDERS EQUITY
Retained Earnings	$2.838B	$2.641B	$2.780B
YoY Change	7.44%	8.13%	7.93%
Common Stock	$2.660B	$2.634B	$2.630B
YoY Change	0.96%	0.74%	0.8%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$9.427M	$4.825M	$1.409M
YoY Change	95.38%	-14.21%	69.15%
Treasury Stock Shares	103.5K shares	58.14K shares	17.37K shares
Shareholders Equity	$5.431B	$5.223B	$5.354B
YoY Change
Total Liabilities & Shareholders Equity	$18.48B	$17.66B	$17.67B
YoY Change	4.61%	3.79%	4.09%

Cashflow Statement

Concept	2019 Q4	2018 Q4	2018 Q3
OPERATING ACTIVITIES
Net Income	$68.85M	$30.95M	$319.9M
YoY Change	122.48%	16.78%	13.86%
Depreciation, Depletion And Amortization	$163.3M	$161.1M	$164.3M
YoY Change	1.37%	-2.3%	6.41%
Cash From Operating Activities	$121.9M	$317.3M	$564.0M
YoY Change	-61.58%	-8.32%	17.18%
INVESTING ACTIVITIES
Capital Expenditures	-$333.5M	-$279.7M	-$218.6M
YoY Change	19.23%	-26.59%	-34.59%
Acquisitions
YoY Change
Other Investing Activities	$34.60M	$200.0K	-$15.80M
YoY Change	17200.0%	-102.53%	-8.67%
Cash From Investing Activities	-$299.0M	-$279.5M	-$234.2M
YoY Change	6.98%	-28.13%	-33.35%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	157.5M	-97.10M	-268.5M
YoY Change	-262.2%	-311.09%	116.01%
NET CHANGE
Cash From Operating Activities	121.9M	317.3M	564.0M
Cash From Investing Activities	-299.0M	-279.5M	-234.2M
Cash From Financing Activities	157.5M	-97.10M	-268.5M
Net Change In Cash	-19.60M	-59.30M	61.30M
YoY Change	-66.95%	-1953.13%	994.64%
FREE CASH FLOW
Cash From Operating Activities	$121.9M	$317.3M	$564.0M
Capital Expenditures	-$333.5M	-$279.7M	-$218.6M
Free Cash Flow	$455.4M	$597.0M	$782.6M
YoY Change	-23.72%	-17.89%	-4.03%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0000764622
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	AZ
CY2018Q4	pnw	Accumulated Amortization On Nuclear Fuel AccumulatedAmortizationOnNuclearFuel	137850000	USD
CY2019Q4	pnw	Accumulated Amortization On Nuclear Fuel AccumulatedAmortizationOnNuclearFuel	137330000	USD
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.70
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.87
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.04
CY2018Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2019Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	150000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	150000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	112159896	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	112540126	shares
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	591202000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	647276000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-375000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	693000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-1585000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	3452000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-1294000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-473000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-24000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	78000	USD
CY2018Q4	us-gaap	Sale Leaseback Transaction Accumulated Depreciation SaleLeasebackTransactionAccumulatedDepreciation	245275000	USD
CY2019Q4	us-gaap	Sale Leaseback Transaction Accumulated Depreciation SaleLeasebackTransactionAccumulatedDepreciation	249144000	USD
CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	58135	shares
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	103546	shares
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	1-8962
CY2019	dei	Entity Registrant Name EntityRegistrantName	PINNACLE WEST CAPITAL CORPORATION
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	AZ
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	86-0512431
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	85072-3999
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	400 North Fifth Street, P.O. Box 53999
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Phoenix
CY2019	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	218579000	USD
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CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	5888000	USD
CY2019	dei	City Area Code CityAreaCode	(602)
CY2019	dei	Local Phone Number LocalPhoneNumber	250-1000
CY2019	dei	Entity Registrant Name EntityRegistrantName	PINNACLE WEST CAPITAL CORPORATION
CY2019	dei	Trading Symbol TradingSymbol	PNW
CY2019	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
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CY2019	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	1042237000	USD
CY2018	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	1076116000	USD
CY2017	us-gaap	Cost Of Goods And Service Excluding Depreciation Depletion And Amortization CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization	981301000	USD
CY2019	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	941616000	USD
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CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	9497000	USD
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CY2017	us-gaap	Costs And Expenses CostsAndExpenses	2655533000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	671960000	USD
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CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	31431000	USD
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CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	488456000	USD
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CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	18528000	USD
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CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-9388000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	5846000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1180000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	548425000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	536386000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	506769000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	19493000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	19493000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	19493000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	528932000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	516893000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	487276000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	10283000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	5766000	USD
CY2019Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	266426000	USD
CY2018Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	267887000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	128165000	USD
CY2019Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	21727000	USD
CY2018Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	0	USD
CY2019Q4	us-gaap	Derivative Instruments And Hedges DerivativeInstrumentsAndHedges	515000	USD
CY2018Q4	us-gaap	Derivative Instruments And Hedges DerivativeInstrumentsAndHedges	1113000	USD
CY2018Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	129738000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	61958000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	56128000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	1030030000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	924991000	USD
CY2019Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	1010775000	USD
CY2018Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	851134000	USD
CY2019Q4	pnw	Coal Reclamationand Union Trust CoalReclamationandUnionTrust	245095000	USD
CY2018Q4	pnw	Coal Reclamationand Union Trust CoalReclamationandUnionTrust	236101000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	96953000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	103247000	USD
CY2019Q4	pnw	Total Investments And Other Assets TotalInvestmentsAndOtherAssets	1352823000	USD
CY2018Q4	pnw	Total Investments And Other Assets TotalInvestmentsAndOtherAssets	1190482000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	19836292000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	18736628000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	6637857000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	6366014000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	13198435000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	12370614000	USD
CY2019Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	808133000	USD
CY2018Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	1170062000	USD
CY2019Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	101906000	USD
CY2018Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	105775000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	290564000	USD
CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	262902000	USD
CY2019Q4	us-gaap	Nuclear Fuel Net Of Amortization NuclearFuelNetOfAmortization	123500000	USD
CY2018Q4	us-gaap	Nuclear Fuel Net Of Amortization NuclearFuelNetOfAmortization	120217000	USD
CY2019Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	14522538000	USD
CY2018Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	14029570000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1304073000	USD
CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1342941000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	145813000	USD
CY2018Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	0	USD
CY2019Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	90570000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	46906000	USD
CY2019Q4	us-gaap	Other Deferred Costs Net OtherDeferredCostsNet	33400000	USD
CY2018Q4	us-gaap	Other Deferred Costs Net OtherDeferredCostsNet	129312000	USD
CY2019Q4	pnw	Total Deferred Debits TotalDeferredDebits	1573856000	USD
CY2018Q4	pnw	Total Deferred Debits TotalDeferredDebits	1519159000	USD
CY2019Q4	us-gaap	Assets Assets	18479247000	USD
CY2018Q4	us-gaap	Assets Assets	17664202000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	346448000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	277336000	USD
CY2019Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	144899000	USD
CY2018Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	154819000	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	53534000	USD
CY2018Q4	us-gaap	Interest Payable Current InterestPayableCurrent	61107000	USD
CY2019Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	87982000	USD
CY2018Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	82675000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	114675000	USD
CY2018Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	76400000	USD
CY2019Q4	us-gaap	Other Long Term Debt Current OtherLongTermDebtCurrent	800000000	USD
CY2018Q4	us-gaap	Other Long Term Debt Current OtherLongTermDebtCurrent	500000000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	64908000	USD
CY2018Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	91174000	USD
CY2019Q4	us-gaap	Derivative Instruments And Hedges Liabilities DerivativeInstrumentsAndHedgesLiabilities	38946000	USD
CY2018Q4	us-gaap	Derivative Instruments And Hedges Liabilities DerivativeInstrumentsAndHedgesLiabilities	35506000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	11025000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	19842000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	12713000	USD
CY2018Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	0	USD
CY2019Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	234912000	USD
CY2018Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	165876000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	168323000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	184229000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2078365000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	1648964000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	4832558000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	4638232000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	1992339000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	1807421000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	2267835000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	2325976000	USD
CY2019Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	646193000	USD
CY2018Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	706703000	USD
CY2019Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	280185000	USD
CY2018Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	443170000	USD
CY2019Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	33186000	USD
CY2018Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	24531000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	215330000	USD
CY2018Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	137153000	USD
CY2019Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	165695000	USD
CY2018Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	212785000	USD
CY2019Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	196468000	USD
CY2018Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	200405000	USD
CY2019Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	6189000	USD
CY2018Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	22517000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	51872000	USD
CY2018Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	0	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	159844000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	147640000	USD
CY2019Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	6015136000	USD
CY2018Q4	us-gaap	Deferred Credits And Other Liabilities DeferredCreditsAndOtherLiabilities	6028301000	USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	2659561000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	2634265000	USD
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	9427000	USD
CY2018Q4	us-gaap	Treasury Stock Value TreasuryStockValue	4825000	USD
CY2019Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	2650134000	USD
CY2018Q4	us-gaap	Common Stock Value Outstanding CommonStockValueOutstanding	2629440000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2837610000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2641183000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-57096000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-47708000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	5430648000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	5222915000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	122540000	USD
CY2018Q4	us-gaap	Minority Interest MinorityInterest	125790000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5553188000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5348705000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	18479247000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	17664202000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	557813000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	530540000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	507949000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	664140000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	650955000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	610629000	USD
CY2019	us-gaap	Increase Decrease In Regulatory Clause Revenue IncreaseDecreaseInRegulatoryClauseRevenue	-82481000	USD
CY2018	us-gaap	Increase Decrease In Regulatory Clause Revenue IncreaseDecreaseInRegulatoryClauseRevenue	-78277000	USD
CY2017	us-gaap	Increase Decrease In Regulatory Clause Revenue IncreaseDecreaseInRegulatoryClauseRevenue	-48405000	USD
CY2019	pnw	Increase Decrease Deferred Fuel And Purchased Power Amortization IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization	49508000	USD
CY2018	pnw	Increase Decrease Deferred Fuel And Purchased Power Amortization IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization	116750000	USD
CY2017	pnw	Increase Decrease Deferred Fuel And Purchased Power Amortization IncreaseDecreaseDeferredFuelAndPurchasedPowerAmortization	-14767000	USD
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	31431000	USD
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	52319000	USD
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	47011000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1479000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	117355000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	248164000	USD
CY2019	pnw	Deferred Investment Tax Credit Expense DeferredInvestmentTaxCreditExpense	-3938000	USD
CY2018	pnw	Deferred Investment Tax Credit Expense DeferredInvestmentTaxCreditExpense	-5170000	USD
CY2017	pnw	Deferred Investment Tax Credit Expense DeferredInvestmentTaxCreditExpense	-4587000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	373000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	18376000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	19547000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	20502000	USD
CY2019	us-gaap	Increase Decrease In Accounts And Notes Receivable IncreaseDecreaseInAccountsAndNotesReceivable	12789000	USD
CY2018	us-gaap	Increase Decrease In Accounts And Notes Receivable IncreaseDecreaseInAccountsAndNotesReceivable	-37530000	USD
CY2017	us-gaap	Increase Decrease In Accounts And Notes Receivable IncreaseDecreaseInAccountsAndNotesReceivable	93797000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	-9005000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	24736000	USD
CY2017	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	4485000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	51826000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	6103000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	6683000	USD
CY2019	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	21727000	USD
CY2018	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	0	USD
CY2017	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-3751000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	3507000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-33844000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	10580000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	50641000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-14602000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-23769000	USD
CY2019	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	-9920000	USD
CY2018	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	6597000	USD
CY2017	us-gaap	Increase Decrease In Accrued Taxes Payable IncreaseDecreaseInAccruedTaxesPayable	9982000	USD
CY2019	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	-84651000	USD
CY2018	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	28174000	USD
CY2017	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	19154000	USD
CY2019	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	247000	USD
CY2018	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	-143000	USD
CY2017	us-gaap	Increase Decrease In Deposit Other Assets IncreaseDecreaseInDepositOtherAssets	300000	USD
CY2019	pnw	Change In Margin And Collateral Accounts Liabilities ChangeInMarginAndCollateralAccountsLiabilities	-125000	USD
CY2018	pnw	Change In Margin And Collateral Accounts Liabilities ChangeInMarginAndCollateralAccountsLiabilities	-2211000	USD
CY2017	pnw	Change In Margin And Collateral Accounts Liabilities ChangeInMarginAndCollateralAccountsLiabilities	-533000	USD
CY2019	pnw	Increase Decrease In Liability For Uncertainty In Income Taxes IncreaseDecreaseInLiabilityForUncertaintyInIncomeTaxes	2704000	USD
CY2018	pnw	Increase Decrease In Liability For Uncertainty In Income Taxes IncreaseDecreaseInLiabilityForUncertaintyInIncomeTaxes	-1235000	USD
CY2017	pnw	Increase Decrease In Liability For Uncertainty In Income Taxes IncreaseDecreaseInLiabilityForUncertaintyInIncomeTaxes	5891000	USD
CY2019	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	124221000	USD
CY2018	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	-109284000	USD
CY2017	us-gaap	Increase Decrease In Regulatory Liabilities IncreaseDecreaseInRegulatoryLiabilities	45764000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	82895000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-78604000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	68480000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-132666000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-48958000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-29980000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	956726000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1277144000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1118036000	USD
CY2019	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1191447000	USD
CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1178169000	USD
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	1408774000	USD
CY2019	us-gaap	Proceeds From Contribution In Aid Of Construction ProceedsFromContributionInAidOfConstruction	70693000	USD
CY2018	us-gaap	Proceeds From Contribution In Aid Of Construction ProceedsFromContributionInAidOfConstruction	27716000	USD
CY2017	us-gaap	Proceeds From Contribution In Aid Of Construction ProceedsFromContributionInAidOfConstruction	23708000	USD
CY2019	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	-18528000	USD
CY2018	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	-25180000	USD
CY2017	us-gaap	Allowance For Funds Used During Construction Investing Activities AllowanceForFundsUsedDuringConstructionInvestingActivities	-22112000	USD
CY2019	us-gaap	Proceeds From Decommissioning Fund ProceedsFromDecommissioningFund	719034000	USD
CY2018	us-gaap	Proceeds From Decommissioning Fund ProceedsFromDecommissioningFund	653033000	USD
CY2017	us-gaap	Proceeds From Decommissioning Fund ProceedsFromDecommissioningFund	542246000	USD
CY2019	us-gaap	Payments To Invest In Decommissioning Fund PaymentsToInvestInDecommissioningFund	722181000	USD
CY2018	us-gaap	Payments To Invest In Decommissioning Fund PaymentsToInvestInDecommissioningFund	672165000	USD
CY2017	us-gaap	Payments To Invest In Decommissioning Fund PaymentsToInvestInDecommissioningFund	544527000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-11452000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1941000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	19078000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1130977000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1192824000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1428537000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1092188000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	445245000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	848239000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	600000000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	182000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	125000000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	54275000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-7000000	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-107800000	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	49000000	USD
CY2018	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	45000000	USD
CY2017	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	58000000	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	65000000	USD
CY2018	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	57000000	USD
CY2017	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	32000000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	329643000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	308892000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	289793000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	692000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-5055000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	-13390000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	22744000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	22744000	USD
CY2017	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	22744000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	178768000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-92446000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	315512000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	4517000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-8126000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	5011000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	5766000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	13892000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	8881000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	10283000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	5766000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	13892000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4935912000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	507949000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1180000	USD
CY2017	us-gaap	Dividends Common Stock DividendsCommonStock	301492000	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	18775000	USD
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	17755000	USD
CY2017	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	16264000	USD
CY2017	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	22743000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5135730000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	530540000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	5846000	USD
CY2018	us-gaap	Dividends Common Stock DividendsCommonStock	320927000	USD
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	19460000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	10338000	USD
CY2018	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	11137000	USD
CY2018	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	22743000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5348705000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	557813000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-9388000	USD
CY2019	us-gaap	Dividends Common Stock DividendsCommonStock	341893000	USD
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	25296000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	11202000	USD
CY2019	us-gaap	Stock Issued During Period Value Treasury Stock Reissued StockIssuedDuringPeriodValueTreasuryStockReissued	6600000	USD
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	22743000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5553188000	USD
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;font-size:11.5pt;"><span style="font-family:inherit;font-size:11.5pt;font-weight:bold;">Accounting Records and Use of Estimates</span></div><div style="line-height:120%;font-size:11.5pt;"><span style="font-family:inherit;font-size:11.5pt;"> </span></div><div style="line-height:120%;text-indent:48px;font-size:11.5pt;"><span style="font-family:inherit;font-size:11.5pt;">Our accounting records are maintained in accordance with accounting principles generally accepted in the United States of America ("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.</span></div><div style="line-height:120%;text-align:center;font-size:11.5pt;"><span style="font-family:inherit;font-size:11.5pt;"><br/></span></div>
CY2019	us-gaap	Cost Of Goods And Services Sold Depreciation CostOfGoodsAndServicesSoldDepreciation	522000000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold Depreciation CostOfGoodsAndServicesSoldDepreciation	486000000	USD
CY2017	us-gaap	Cost Of Goods And Services Sold Depreciation CostOfGoodsAndServicesSoldDepreciation	453000000	USD
CY2019	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0281
CY2018	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0281
CY2017	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0280
CY2019	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.0698
CY2018	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.0703
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Rate PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate	0.0668
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	11262000	USD
CY2018	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	12535000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	21173000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2186000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	218664000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	208479000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	189288000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	141297000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	132620000	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	130404000	USD
CY2019Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	87982000	USD
CY2018Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	82675000	USD
CY2017Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	77667000	USD
CY2017	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2019	us-gaap	Noncash Or Part Noncash Divestiture Amount Of Consideration Received1 NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1	0	USD
CY2018	us-gaap	Noncash Or Part Noncash Divestiture Amount Of Consideration Received1 NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1	68907000	USD
CY2017	us-gaap	Noncash Or Part Noncash Divestiture Amount Of Consideration Received1 NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1	0	USD
CY2019	pnw	Income Tax Percentage Likelihood Largest Tax Benefit Amountis Realized IncomeTaxPercentageLikelihoodLargestTaxBenefitAmountisRealized	0.50
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	66000000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	68000000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	72000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	68000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	52000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	41000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	32000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	22000000	USD
CY2019	us-gaap	Finite Lived Intangible Assets Remaining Amortization Period1 FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1	P8Y
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3471209000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3691247000	USD
CY2019	pnw	Regulatory Cost Recovery Revenue RegulatoryCostRecoveryRevenue	56000000	USD
CY2018	pnw	Regulatory Cost Recovery Revenue RegulatoryCostRecoveryRevenue	47000000	USD
CY2019Q4	pnw	Public Utilities Requested Longterm Debt Cost Of Capital Percentage PublicUtilitiesRequestedLongtermDebtCostOfCapitalPercentage	0.0410
CY2019Q4	pnw	Public Utilities Requested Equity Cost Of Capital Percentage PublicUtilitiesRequestedEquityCostOfCapitalPercentage	0.1015
CY2019Q4	pnw	Public Utilities Requested Weighted Average Cost Of Capital Percentage PublicUtilitiesRequestedWeightedAverageCostOfCapitalPercentage	0.0741
CY2019Q4	pnw	Rate Plan Comparison Tool Number Of Customers RatePlanComparisonToolNumberOfCustomers	13000	Customer
CY2017	us-gaap	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateProvisionalIncomeTaxExpenseBenefit	1140000000	USD
CY2018Q1	pnw	Public Utilities Ballot Initiative Proposed Required Energy Supply From Renewable Sources Percent PublicUtilitiesBallotInitiativeProposedRequiredEnergySupplyFromRenewableSourcesPercent	0.50
CY2019Q4	pnw	Rate Plan Comparison Tool Inconvenience Payment RatePlanComparisonToolInconveniencePayment	25	USD
CY2019Q4	pnw	Regulatory Asset Including Deferred Fuel And Purchased Power Regulatory Asset Current RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent	203207000	USD
CY2019Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1304073000	USD
CY2018Q4	pnw	Regulatory Asset Including Deferred Fuel And Purchased Power Regulatory Asset Current RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent	166902000	USD
CY2018Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1342941000	USD
CY2019Q4	pnw	Regulatory Liability Including Deferred Fuel And Purchased Power Regulatory Liability Current RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent	234912000	USD
CY2019Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	2267835000	USD
CY2018Q4	pnw	Regulatory Liability Including Deferred Fuel And Purchased Power Regulatory Liability Current RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent	165876000	USD
CY2018Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	2325976000	USD
CY2019Q4	us-gaap	Income Tax Reconciliation Deductions Other IncomeTaxReconciliationDeductionsOther	57000000	USD
CY2019	us-gaap	Regulatory Liability Amortization Period RegulatoryLiabilityAmortizationPeriod	P28Y6M
CY2019Q4	us-gaap	Income Tax Reconciliation Deductions Other IncomeTaxReconciliationDeductionsOther	62000000	USD
CY2019Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	56000000	USD
CY2019	pnw	Income Tax Expense Benefit Attributable To Non Controlling Interests IncomeTaxExpenseBenefitAttributableToNonControllingInterests	0	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	40731000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	41966000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	36075000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3373000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3436000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2937000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1843000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2696000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	4783000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	2078000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1764000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1829000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	434000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	5603000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	43435000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	40731000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	41966000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	22813000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	19504000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	16373000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	459000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	-780000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	577000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	1589000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	1130000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	1910000	USD
CY2019Q4	pnw	Unrecognized Tax Benefits Interest On Income Taxes Receivable UnrecognizedTaxBenefitsInterestOnIncomeTaxesReceivable	1000000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-13551000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	18375000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	11624000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3195000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3342000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3052000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-10356000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	21717000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	14676000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-14982000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	94721000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	223729000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	9565000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	17464000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	19867000	USD
CY2019	pnw	Deferred Income Tax Expense Benefit Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations	-5417000	USD
CY2018	pnw	Deferred Income Tax Expense Benefit Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations	112185000	USD
CY2017	pnw	Deferred Income Tax Expense Benefit Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations	243596000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-15773000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	133902000	USD
CY2019	pnw	Effective Income Tax Rate Reconciliation State Income Tax Credit Net Of Federal Income Tax EffectiveIncomeTaxRateReconciliationStateIncomeTaxCreditNetOfFederalIncomeTax	-8519000	USD
CY2018	pnw	Effective Income Tax Rate Reconciliation State Income Tax Credit Net Of Federal Income Tax EffectiveIncomeTaxRateReconciliationStateIncomeTaxCreditNetOfFederalIncomeTax	-6704000	USD
CY2017	pnw	Effective Income Tax Rate Reconciliation State Income Tax Credit Net Of Federal Income Tax EffectiveIncomeTaxRateReconciliationStateIncomeTaxCreditNetOfFederalIncomeTax	-6483000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	0	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	7879000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	0	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-2252000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-1804000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-6659000	USD
CY2019	pnw	Effective Income Tax Rate Reconciliation Excess Deferred Income Taxes Amount EffectiveIncomeTaxRateReconciliationExcessDeferredIncomeTaxesAmount	-124082000	USD
CY2018	pnw	Effective Income Tax Rate Reconciliation Excess Deferred Income Taxes Amount EffectiveIncomeTaxRateReconciliationExcessDeferredIncomeTaxesAmount	-6725000	USD
CY2017	pnw	Effective Income Tax Rate Reconciliation Excess Deferred Income Taxes Amount EffectiveIncomeTaxRateReconciliationExcessDeferredIncomeTaxesAmount	9348000	USD
CY2019	pnw	Income Tax Reconciliation Allowance For Equity Funds Used During Construction IncomeTaxReconciliationAllowanceForEquityFundsUsedDuringConstruction	2476000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	258272000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	113828000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	139533000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	268177000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	18599000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	23115000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	21380000	USD
CY2018	pnw	Income Tax Reconciliation Allowance For Equity Funds Used During Construction IncomeTaxReconciliationAllowanceForEquityFundsUsedDuringConstruction	7231000	USD
CY2017	pnw	Income Tax Reconciliation Allowance For Equity Funds Used During Construction IncomeTaxReconciliationAllowanceForEquityFundsUsedDuringConstruction	12937000	USD
CY2019	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	4094000	USD
CY2018	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	4094000	USD
CY2017	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	6823000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	6851000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	6742000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	6715000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	74000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-3325000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1016000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-15773000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	133902000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	258272000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	17552000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	15785000	USD
CY2019Q4	pnw	Deferred Tax Assets Excess Deferred Income Taxes DeferredTaxAssetsExcessDeferredIncomeTaxes	335877000	USD
CY2018Q4	pnw	Deferred Tax Assets Excess Deferred Income Taxes DeferredTaxAssetsExcessDeferredIncomeTaxes	376869000	USD
CY2019Q4	pnw	Deferred Tax Assets Regulatory Liabilities Asset Retirement Obligation And Removal Costs DeferredTaxAssetsRegulatoryLiabilitiesAssetRetirementObligationAndRemovalCosts	143011000	USD
CY2018Q4	pnw	Deferred Tax Assets Regulatory Liabilities Asset Retirement Obligation And Removal Costs DeferredTaxAssetsRegulatoryLiabilitiesAssetRetirementObligationAndRemovalCosts	117201000	USD
CY2019Q4	pnw	Deferred Tax Assets Regulatory Liabilities Unamortized Investment Tax Credits DeferredTaxAssetsRegulatoryLiabilitiesUnamortizedInvestmentTaxCredits	52236000	USD
CY2018Q4	pnw	Deferred Tax Assets Regulatory Liabilities Unamortized Investment Tax Credits DeferredTaxAssetsRegulatoryLiabilitiesUnamortizedInvestmentTaxCredits	53284000	USD
CY2019Q4	pnw	Deferred Tax Assets Regulatory Liabilities Other Postretirement Benefits DeferredTaxAssetsRegulatoryLiabilitiesOtherPostretirementBenefits	43841000	USD
CY2018Q4	pnw	Deferred Tax Assets Regulatory Liabilities Other Postretirement Benefits DeferredTaxAssetsRegulatoryLiabilitiesOtherPostretirementBenefits	40532000	USD
CY2019Q4	pnw	Deferred Tax Assets Regulatory Liabilities Other DeferredTaxAssetsRegulatoryLiabilitiesOther	52382000	USD
CY2018Q4	pnw	Deferred Tax Assets Regulatory Liabilities Other DeferredTaxAssetsRegulatoryLiabilitiesOther	40380000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	73210000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	112019000	USD
CY2019Q4	pnw	Deferred Tax Assets Coal Reclamation Liabilities DeferredTaxAssetsCoalReclamationLiabilities	40837000	USD
CY2018Q4	pnw	Deferred Tax Assets Coal Reclamation Liabilities DeferredTaxAssetsCoalReclamationLiabilities	47508000	USD
CY2019Q4	pnw	Deferred Tax Assets Renewable Energy Incentives DeferredTaxAssetsRenewableEnergyIncentives	28066000	USD
CY2018Q4	pnw	Deferred Tax Assets Renewable Energy Incentives DeferredTaxAssetsRenewableEnergyIncentives	30779000	USD
CY2019Q4	pnw	Deferred Tax Assets Credit And Loss Carryforwards DeferredTaxAssetsCreditAndLossCarryforwards	54795000	USD
CY2018Q4	pnw	Deferred Tax Assets Credit And Loss Carryforwards DeferredTaxAssetsCreditAndLossCarryforwards	1755000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	63102000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	58820000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	904909000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	894932000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2448458000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2277724000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	27000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	237000	USD
CY2019Q4	pnw	Deferred Tax Liabilities Other Postretirement Assets DeferredTaxLiabilitiesOtherPostretirementAssets	66399000	USD
CY2018Q4	pnw	Deferred Tax Liabilities Other Postretirement Assets DeferredTaxLiabilitiesOtherPostretirementAssets	57697000	USD
CY2019Q4	pnw	Deferred Tax Liabilities Regulatory Assets Allowance For Equity Funds Used During Construction DeferredTaxLiabilitiesRegulatoryAssetsAllowanceForEquityFundsUsedDuringConstruction	40023000	USD
CY2018Q4	pnw	Deferred Tax Liabilities Regulatory Assets Allowance For Equity Funds Used During Construction DeferredTaxLiabilitiesRegulatoryAssetsAllowanceForEquityFundsUsedDuringConstruction	39086000	USD
CY2019Q4	pnw	Deferred Tax Liabilities Regulatory Assets Deferred Fuel And Purchased Power Mark To Market DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPowerMarkToMarket	35162000	USD
CY2018Q4	pnw	Deferred Tax Liabilities Regulatory Assets Deferred Fuel And Purchased Power Mark To Market DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPowerMarkToMarket	23086000	USD
CY2019Q4	pnw	Deferred Tax Liabilities Regulatory Assets Pension And Other Postretirement Benefits DeferredTaxLiabilitiesRegulatoryAssetsPensionAndOtherPostretirementBenefits	163339000	USD
CY2018Q4	pnw	Deferred Tax Liabilities Regulatory Assets Pension And Other Postretirement Benefits DeferredTaxLiabilitiesRegulatoryAssetsPensionAndOtherPostretirementBenefits	181504000	USD
CY2019Q4	pnw	Deferred Tax Liabilities Regulatory Assets Retired Power Plan Costs DeferredTaxLiabilitiesRegulatoryAssetsRetiredPowerPlanCosts	42228000	USD
CY2018Q4	pnw	Deferred Tax Liabilities Regulatory Assets Retired Power Plan Costs DeferredTaxLiabilitiesRegulatoryAssetsRetiredPowerPlanCosts	48348000	USD
CY2019Q4	pnw	Deferred Tax Liabilities Regulatory Assets Other DeferredTaxLiabilitiesRegulatoryAssetsOther	82722000	USD
CY2018Q4	pnw	Deferred Tax Liabilities Regulatory Assets Other DeferredTaxLiabilitiesRegulatoryAssetsOther	72096000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	18890000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	2575000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	2897248000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	2702353000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards General Business DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness	62000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1992339000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1807421000	USD
CY2019	pnw	Increase Decrease In Deferred Income Taxes Due To Regulation Adoption IncreaseDecreaseInDeferredIncomeTaxesDueToRegulationAdoption	-39000000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	4832558000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	4638232000	USD
CY2019Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	5632558000	USD
CY2019Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	6194392000	USD
CY2018Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	5138232000	USD
CY2018Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	5233563000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.0400
CY2018Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease	0.0400
CY2019	pnw	Defined Benefit Plan Pre65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Obligation DefinedBenefitPlanPre65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitObligation	0.0700
CY2018	pnw	Defined Benefit Plan Pre65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Obligation DefinedBenefitPlanPre65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitObligation	0.0700
CY2019	pnw	Defined Benefit Plan Pre65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPre65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0700
CY2018	pnw	Defined Benefit Plan Pre65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPre65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0700
CY2017	pnw	Defined Benefit Plan Pre65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPre65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0700
CY2019	pnw	Defined Benefit Plan Post65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Obligation DefinedBenefitPlanPost65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitObligation	0.0475
CY2018	pnw	Defined Benefit Plan Post65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Obligation DefinedBenefitPlanPost65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitObligation	0.0475
CY2019	pnw	Defined Benefit Plan Post65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPost65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0475
CY2019	pnw	Defined Benefit Plan Ultimate Health Care Cost Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanUltimateHealthCareCostTrendRateusedinCalculatingBenefitObligations	0.0475
CY2018	pnw	Defined Benefit Plan Post65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPost65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0475
CY2017	pnw	Defined Benefit Plan Post65 Health Care Cost Trend Rate Assumedfor Next Fiscal Year Usedin Calculating Benefit Costs DefinedBenefitPlanPost65HealthCareCostTrendRateAssumedforNextFiscalYearUsedinCalculatingBenefitCosts	0.0500
CY2018	pnw	Defined Benefit Plan Ultimate Health Care Cost Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanUltimateHealthCareCostTrendRateusedinCalculatingBenefitObligations	0.0475
CY2019Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.0475
CY2018Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.0475
CY2017Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.0500
CY2019	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitObligations	P6Y
CY2018	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Obligations DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitObligations	P7Y
CY2019	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P7Y
CY2018	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P8Y
CY2017	pnw	Defined Benefit Plan Pre65 Participant Periodafterwhich Rate Reaches Ultimate Trend Rateusedin Calculating Benefit Costs DefinedBenefitPlanPre65ParticipantPeriodafterwhichRateReachesUltimateTrendRateusedinCalculatingBenefitCosts	P4Y
CY2019Q4	pnw	Defined Benefit Plan Partnership Funding Commitments Maximum Contribution Amount DefinedBenefitPlanPartnershipFundingCommitmentsMaximumContributionAmount	50000000	USD
CY2019	pnw	Defined Benefit Plan Partnership Funding Commitments Funded Amount DefinedBenefitPlanPartnershipFundingCommitmentsFundedAmount	38000000	USD
CY2019Q4	pnw	Number Of Lease Agreements Lease And Sell Back NumberOfLeaseAgreementsLeaseAndSellBack	3	Counterparty
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	194000000	USD
CY2019Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	119000000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	60228000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	114015000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	4385000	USD
CY2019	us-gaap	Lease Cost LeaseCost	178628000	USD
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	18000000	USD
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	18000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	14698000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	11963000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	8331000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	6326000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	4141000	USD
CY2019Q4	pnw	Lessee Operating Lease Liability Payments Dueafter Year Six LesseeOperatingLeaseLiabilityPaymentsDueafterYearSix	38697000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	84156000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	19571000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	64585000	USD
CY2019Q4	pnw	Lease Notyet Commenced Liability Leaseand Nonlease Payments LeaseNotyetCommencedLiabilityLeaseandNonleasePayments	705000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	68246000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	12428000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	9478000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	6513000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	5359000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	42236000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	144260000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P13Y
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0371
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	69075000	USD
CY2019Q4	pnw	Equity Contribution Guarantees EquityContributionGuarantees	40000000	USD
CY2019Q1	us-gaap	Revenues Revenues	740530000	USD
CY2019Q2	us-gaap	Revenues Revenues	869501000	USD
CY2019Q3	us-gaap	Revenues Revenues	1190787000	USD
CY2019Q4	us-gaap	Revenues Revenues	670391000	USD
CY2019	us-gaap	Revenues Revenues	3471209000	USD
CY2019Q1	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	245634000	USD
CY2019Q2	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	227543000	USD
CY2019Q3	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	238582000	USD
CY2019Q4	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	229857000	USD
CY2019	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	941616000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	60084000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	196589000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	403290000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	22791000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	149019000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	317149000	USD
CY2019Q4	us-gaap	Profit Loss ProfitLoss	68854000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	557813000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.16
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.28
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.78
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	11997000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	671960000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2418000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17080000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	53266000	USD
CY2019Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-88537000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-15773000	USD
CY2019Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	17918000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	144145000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	312276000	USD
CY2019Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	63981000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	538320000	USD
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.79
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.16
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.28
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.77
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.57
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.77
CY2018Q1	us-gaap	Revenues Revenues	692714000	USD
CY2018Q2	us-gaap	Revenues Revenues	974123000	USD
CY2018Q3	us-gaap	Revenues Revenues	1268034000	USD
CY2018Q4	us-gaap	Revenues Revenues	756376000	USD
CY2018	us-gaap	Revenues Revenues	3691247000	USD
CY2018Q1	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	265682000	USD
CY2018Q2	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	268397000	USD
CY2018Q3	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	246545000	USD
CY2018Q4	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	256120000	USD
CY2018	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1036744000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	31334000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	242162000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	433307000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	66884000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	773687000	USD
CY2018Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1265000	USD
CY2018Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	44039000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	84333000	USD
CY2018Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6795000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	133902000	USD
CY2018Q1	us-gaap	Profit Loss ProfitLoss	8094000	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	171612000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	319885000	USD
CY2018Q4	us-gaap	Profit Loss ProfitLoss	30949000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	530540000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	3221000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	166738000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	315012000	USD
CY2018Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	26076000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	511047000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.03
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.49
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.81
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.23
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.56
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.03
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.48
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.80
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.23
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.54
CY2019Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	69000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	515000	USD
CY2019Q4	pnw	Decommissioning Fund Investments Fair Value Net Pending Securities Salesand Purchases DecommissioningFundInvestmentsFairValueNetPendingSecuritiesSalesandPurchases	521245000	USD
CY2019Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	1010775000	USD
CY2019Q4	pnw	Special Use Fund Investments Other Net Fair Value Pending Salesand Purchases SpecialUseFundInvestmentsOtherNetFairValuePendingSalesandPurchases	474000	USD
CY2019Q4	pnw	Special Use Fund Investments Other Gross Fair Value SpecialUseFundInvestmentsOtherGrossFairValue	245095000	USD
CY2019Q4	pnw	Assets Fair Value Gross Liabilityand Net Pending Securities Salesand Purchases AssetsFairValueGrossLiabilityandNetPendingSecuritiesSalesandPurchases	521650000	USD
CY2019Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	1256385000	USD
CY2019Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	711000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	72132000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	1200000	USD
CY2018Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	2029000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	1113000	USD
CY2018Q4	pnw	Decommissioning Fund Investments Fair Value Net Pending Securities Salesand Purchases DecommissioningFundInvestmentsFairValueNetPendingSecuritiesSalesandPurchases	398953000	USD
CY2018Q4	us-gaap	Decommissioning Trust Assets Amount DecommissioningTrustAssetsAmount	851134000	USD
CY2018Q4	pnw	Special Use Fund Investments Other Net Fair Value Pending Salesand Purchases SpecialUseFundInvestmentsOtherNetFairValuePendingSalesandPurchases	593000	USD
CY2018Q4	pnw	Special Use Fund Investments Other Gross Fair Value SpecialUseFundInvestmentsOtherGrossFairValue	236101000	USD
CY2018Q4	pnw	Assets Fair Value Gross Liabilityand Net Pending Securities Salesand Purchases AssetsFairValueGrossLiabilityandNetPendingSecuritiesSalesandPurchases	397517000	USD
CY2018Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	1089548000	USD
CY2018Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	875000	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	60037000	USD
CY2018Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	-8214000	USD
CY2017Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	-18256000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	0	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Gain Loss Included In Earnings FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings	0	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	0	USD
CY2018	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	0	USD
CY2019	pnw	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Derivative Gain Loss Deferred As Regulatory Asset Or Liability FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDerivativeGainLossDeferredAsRegulatoryAssetOrLiability	-13457000	USD
CY2018	pnw	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Derivative Gain Loss Deferred As Regulatory Asset Or Liability FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDerivativeGainLossDeferredAsRegulatoryAssetOrLiability	-1130000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements	-12250000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Settlements FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements	787000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Into Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3	-6512000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Into Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3	-12830000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	-12537000	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Inputs Reconciliation Transfers Out Of Level3 FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3	-24789000	USD
CY2019Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	-3396000	USD
CY2018Q4	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis With Unobservable Inputs FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs	-8214000	USD
CY2019	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Change In Unrealized Gain Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	0	USD
CY2018	us-gaap	Fair Value Net Derivative Asset Liability Measured On Recurring Basis Change In Unrealized Gain Loss FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss	0	USD
CY2019	pnw	Fair Value Measurement Inter Level Transfers Amount FairValueMeasurementInterLevelTransfersAmount	0	USD
CY2019Q4	pnw	Stated Interest Ratefor Notes Receivable StatedInterestRateforNotesReceivable	0.039
CY2019Q4	us-gaap	Notes Receivable Net NotesReceivableNet	44300000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	538320000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	511047000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	488456000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	112443000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	112129000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	111839000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	315000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	421000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	528000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	112758000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	112550000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	112367000	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.79
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.56
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.37
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.77
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.54
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.35
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	18000000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	20000000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	21000000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	7000000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	7000000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	15000000	USD
CY2019Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	9000000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y
CY2019	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
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	24000000	USD
CY2017	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
CY2019	pnw	Share Based Compensation Arrangement By Share Based Payment Award Number Of Performance Elements Criteria ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPerformanceElementsCriteria	2	performance_criteria
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Requisite Service Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1	P3Y
CY2019	us-gaap	Investment Income Interest InvestmentIncomeInterest	10377000	USD
CY2018	us-gaap	Investment Income Interest InvestmentIncomeInterest	8647000	USD
CY2017	us-gaap	Investment Income Interest InvestmentIncomeInterest	3497000	USD
CY2019	pnw	Miscellaneous Other Nonoperating Income MiscellaneousOtherNonoperatingIncome	63000	USD
CY2018	pnw	Miscellaneous Other Nonoperating Income MiscellaneousOtherNonoperatingIncome	96000	USD
CY2017	pnw	Miscellaneous Other Nonoperating Income MiscellaneousOtherNonoperatingIncome	155000	USD
CY2019	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	50263000	USD
CY2018	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	24896000	USD
CY2017	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	4006000	USD
CY2019	pnw	Nonoperating Costs NonoperatingCosts	10663000	USD
CY2018	pnw	Nonoperating Costs NonoperatingCosts	10076000	USD
CY2017	pnw	Nonoperating Costs NonoperatingCosts	11749000	USD
CY2019	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	1835000	USD
CY2018	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	417000	USD
CY2017	us-gaap	Loss On Sale Of Investments LossOnSaleOfInvestments	4113000	USD
CY2019	pnw	Miscellaneous Other Nonoperating Expense MiscellaneousOtherNonoperatingExpense	5382000	USD
CY2018	pnw	Miscellaneous Other Nonoperating Expense MiscellaneousOtherNonoperatingExpense	7473000	USD
CY2017	pnw	Miscellaneous Other Nonoperating Expense MiscellaneousOtherNonoperatingExpense	5677000	USD
CY2019	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	17880000	USD
CY2018	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	17966000	USD
CY2017	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	21539000	USD

Files In Submission

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$PNW
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2019 Q4 Form 10-K Financial Statement

#000076462220000017 Filed on February 21, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$PNW PINNACLE WEST CAPITAL CORP Stock $pnw

2019 Q4 Form 10-K Financial Statement

#000076462220000017 Filed on February 21, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$PNW
PINNACLE WEST CAPITAL CORP Stock $pnw