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Long-Term Debt and Liquidity Matters - Fair Value of Long-Term Debt (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Estimated fair value of long-term debt, including current maturities    
Long-term debt $ 3,415,000,000us-gaap_DebtAndCapitalLeaseObligations $ 3,337,000,000us-gaap_DebtAndCapitalLeaseObligations
Long-term debt, fair value 3,839,000,000us-gaap_LongTermDebtFairValue 3,579,000,000us-gaap_LongTermDebtFairValue
Pinnacle West    
Estimated fair value of long-term debt, including current maturities    
Long-term debt 125,000,000us-gaap_DebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 125,000,000us-gaap_DebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Long-term debt, fair value 125,000,000us-gaap_LongTermDebtFairValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 125,000,000us-gaap_LongTermDebtFairValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
ARIZONA PUBLIC SERVICE COMPANY    
Estimated fair value of long-term debt, including current maturities    
Long-term debt 3,289,785,000us-gaap_DebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember		 3,211,889,000us-gaap_DebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Long-term debt, fair value $ 3,714,000,000us-gaap_LongTermDebtFairValue
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember		 $ 3,454,000,000us-gaap_LongTermDebtFairValue
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember