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Long-Term Debt and Liquidity Matters - Narrative (Details) | May. 19, 2015 USD ($) | Jun. 30, 2015 USD ($) Facility | Jun. 26, 2015 USD ($) | May. 28, 2015 USD ($) | Jan. 12, 2015 USD ($) | Dec. 31, 2014 USD ($)
--- | --- | --- | --- | --- | --- | ---
Debt Provisions |  |  |  |  |  |
Total shareholder equity |  | $ 4,392,836,000 |  |  |  | $ 4,367,493,000
Pinnacle West | Letter of Credit [Member] | Revolving credit facility that matures in May 2019 |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |
Outstanding letters of credit |  | 0 |  |  |  |
Pinnacle West | Revolving Credit Facility | Revolving credit facility that matures in May 2019 |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |
Current borrowing capacity on credit facility |  | 200,000,000 |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders |  | 300,000,000 |  |  |  |
Outstanding borrowings |  | 0 |  |  |  |
Pinnacle West | Commercial paper | Revolving credit facility that matures in May 2019 |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |
Maximum commercial paper support available under credit facility |  | 200,000,000 |  |  |  |
Commercial paper |  | 0 |  |  |  |
APS |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |
Total shareholder equity |  | 4,494,357,000 |  |  |  | $ 4,478,243,000
APS | ACC |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |
Total shareholder equity |  | 4,500,000,000 |  |  |  |
Total capitalization |  | 8,200,000,000 |  |  |  |
Dividend restrictions, shareholder equity required |  | $ 3,300,000,000 |  |  |  |
APS | ACC | Minimum |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |
Required common equity ratio ordered by ACC (as a percent) |  | 40.00% |  |  |  |
APS | Arizona pollution control revenue refunding bond, 2009 series B, due 2029 |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |
Repurchased debt |  |  |  | $ 32,000,000 |  |
APS | Letter of Credit [Member] |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |
Outstanding letters of credit |  | $ 76,000,000 |  |  |  |
APS | Letter of Credit [Member] | Revolving credit facilities maturing in 2018 and 2019 |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |
Outstanding letters of credit |  | 0 |  |  |  |
APS | Revolving Credit Facility | Revolving credit facilities maturing in 2018 and 2019 |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |
Current borrowing capacity on credit facility |  | 1,000,000,000 |  |  |  |
Outstanding borrowings |  | $ 0 |  |  |  |
Number of line of credit facilities | Facility |  | 2 |  |  |  |
APS | Revolving Credit Facility | Revolving credit facility maturing April 2018 |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |
Current borrowing capacity on credit facility |  | $ 500,000,000 |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders |  | 700,000,000 |  |  |  |
APS | Revolving Credit Facility | Revolving credit facility maturing May 2019 |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |
Current borrowing capacity on credit facility |  | 500,000,000 |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders |  | 700,000,000 |  |  |  |
APS | Commercial paper |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |
Maximum commercial paper support available under credit facility |  | 250,000,000 |  |  |  |
Commercial paper |  | $ 158,000,000 |  |  |  |
APS | Secured debt | Term loan facility maturing June 26, 2018 |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |
Debt issued |  |  | $ 50,000,000 |  |  |
APS | Senior Notes | 2.20% unsecured senior notes that mature on January 15, 2020 |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |
Debt issued |  |  |  |  | $ 250,000,000 |
Interest rate (as a percent) |  |  |  |  | 2.20% |
APS | Senior Notes | 3.15% unsecured senior notes that mature on May 15, 2025 |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |
Debt issued | $ 300,000,000 |  |  |  |  |
Interest rate (as a percent) | 3.15% |  |  |  |  |
Extinguishment of Debt, Amount | $ 300,000,000 |  |  |  |  |
APS | Senior Notes | 4.65% unsecured senior notes that mature on May 15, 2015 |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |
Interest rate (as a percent) | 4.65% |  |  |  |  |

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