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Long-Term Debt and Liquidity Matters Estimated Fair Value of Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Estimated fair value of long-term debt, including current maturities    
Debt and Capital Lease Obligations $ 3,665us-gaap_DebtAndCapitalLeaseObligations $ 3,415us-gaap_DebtAndCapitalLeaseObligations
Long-term Debt, Fair Value 4,170us-gaap_LongTermDebtFairValue 3,839us-gaap_LongTermDebtFairValue
Pinnacle West    
Estimated fair value of long-term debt, including current maturities    
Debt and Capital Lease Obligations 125us-gaap_DebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 125us-gaap_DebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Long-term Debt, Fair Value 125us-gaap_LongTermDebtFairValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 125us-gaap_LongTermDebtFairValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Arizona Public Service Company    
Estimated fair value of long-term debt, including current maturities    
Debt and Capital Lease Obligations 3,540us-gaap_DebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember		 3,290us-gaap_DebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Long-term Debt, Fair Value $ 4,045us-gaap_LongTermDebtFairValue
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember		 $ 3,714us-gaap_LongTermDebtFairValue
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember