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Long-Term Debt and Liquidity Matters - Narrative (Details) | Aug. 01, 2016 USD ($) | Jun. 30, 2016 USD ($) Facility | Jun. 01, 2016 USD ($) | May 13, 2016 USD ($) | May 12, 2016 USD ($) | May 06, 2016 USD ($) | Apr. 22, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Provisions |  |  |  |  |  |  |  |  |
Total shareholder equity |  | $ 4,585,268,000 |  |  |  |  |  |  | $ 4,583,917,000
Pinnacle West | Revolving Credit Facility | Revolving credit facility maturing in May 2019 |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  |  | $ 200,000,000 |  |  |  |
Pinnacle West | Revolving Credit Facility | Revolving credit facility maturing May 2021 |  |  |  |  |  |  |  |  |
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 (up to) |  | 300,000,000 |  |  |  |  |  |  |
Outstanding borrowings |  | 0 |  |  |  |  |  |  |
Pinnacle West | Letter of Credit | Revolving credit facility maturing May 2021 |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  | 0 |  |  |  |  |  |  |
Pinnacle West | Commercial paper | Revolving credit facility maturing May 2021 |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |
Commercial paper |  | 0 |  |  |  |  |  |  |
APS |  |  |  |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |  |  |  |
Total shareholder equity |  | 4,675,864,000 |  |  |  |  |  |  | 4,679,254,000
APS | ACC |  |  |  |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |  |  |  |
Total shareholder equity |  | 4,700,000,000 |  |  |  |  |  |  |
Total capitalization |  | 8,900,000,000 |  |  |  |  |  |  |
Dividend restrictions, shareholder equity required |  | $ 3,600,000,000 |  |  |  |  |  |  |
APS | ACC | Minimum |  |  |  |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |  |  |  |
Required common equity ratio ordered by ACC (as a percent) (at least) |  | 40.00% |  |  |  |  |  |  |
APS | Arizona pollution control corporation revenue refunding bonds, 2009 series A |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |
Debt Instrument, repurchased face amount |  |  | $ 12,850,000 |  |  |  |  |  |
APS | Revolving Credit Facility | Revolving credit facility maturing in May 2019 |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  |  |  |  | $ 500,000,000 |  |  |  |
APS | Revolving Credit Facility | Revolving Credit Facilities Maturing in 2020 and 2021 |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  | $ 1,000,000,000 |  |  |  |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  | 1,400,000,000 |  |  |  |  |  |  |
Outstanding borrowings |  | $ 0 |  |  |  |  |  |  |
Number of line of credit facilities | Facility |  | 2 |  |  |  |  |  |  |
APS | Revolving Credit Facility | Revolving credit facility maturing May 2021 |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |
Current borrowing capacity on credit facility |  | $ 500,000,000 |  | $ 500,000,000 |  |  |  |  |
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) |  | 700,000,000 |  |  |  |  |  |  |
APS | Revolving Credit Facility | Revolving credit facility maturing September 2020 |  |  |  |  |  |  |  |  |
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 (up to) |  | 700,000,000 |  |  |  |  |  |  |
APS | Commercial paper |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |
Maximum commercial paper support available under credit facility |  | 500,000,000 |  |  |  |  |  | $ 500,000,000 | $ 250,000,000
APS | Commercial paper | Revolving Credit Facilities Maturing in 2020 and 2021 |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |
Commercial paper |  | $ 64,140,000 |  |  |  |  |  |  |
APS | Secured debt | Term loan facility maturing April 22, 2019 |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  | $ 100,000,000 |  |
Senior Notes | APS | Unsecured senior notes 3.75 percent mature on 15 May, 2046 |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 350,000,000 |  |  |
Debt instrument, stated interest rate |  |  |  |  |  | 3.75% |  |  |
Current Maturities of Long-term Debt | APS | Arizona pollution control corporation revenue refunding bonds, 2009 series D and E |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |
Debt Instrument, repurchased face amount |  |  | $ 64,000,000 |  |  |  |  |  |
Subsequent Event | Senior Notes | APS | Unsecured Senior Notes 6.25 Percent Mature on 01 August, 2016 [Member] |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters |  |  |  |  |  |  |  |  |
Debt instrument, stated interest rate | 6.25% |  |  |  |  |  |  |  |
Repayments of debt | $ 250,000,000 |  |  |  |  |  |  |  |

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