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Long-Term Debt and Liquidity Matters (Details) - USD ($) |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 21, 2018 | Nov. 30, 2018 | Jun. 26, 2018 | May 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 27, 2018 | Nov. 26, 2018 | Aug. 09, 2018
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 3.90% |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |  |  |  |  |
Ratio of consolidated debt to consolidated capitalization (as a percent) |  |  |  |  | 65.00% |  |  |  |  |
Pinnacle West |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Contribution to subsidiaries | $ 150,000,000 |  |  |  | $ 142,796,000 | $ 178,027,000 | $ 19,242,000 |  |  |
Debt Provisions |  |  |  |  |  |  |  |  |  |
Actual ratio of consolidated debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent) |  |  |  |  | 50.00% |  |  |  |  |
Pinnacle West | Term loan |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity on credit facility | $ 150,000,000 |  |  |  |  |  |  |  |  |
ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |  |  |  |  |
Actual ratio of consolidated debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent) |  |  |  |  | 46.00% |  |  |  |  |
ARIZONA PUBLIC SERVICE COMPANY | ACC |  |  |  |  |  |  |  |  |  |
Debt Provisions |  |  |  |  |  |  |  |  |  |
Long term debt authorization |  |  |  |  |  |  |  | $ 5,900,000,000 | $ 5,100,000,000 |
ARIZONA PUBLIC SERVICE COMPANY | Senior notes |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  |  |  |  | $ 300,000,000
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 4.20%
Total Pollution Control Bonds | ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  | $ 32,000,000 |  |  |  |  |  |
Senior unsecured notes | Pinnacle West |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 2.25% |  |  |  |  |
Term loan facility | ARIZONA PUBLIC SERVICE COMPANY | Revolving credit facility |  |  |  |  |  |  |  |  |  |
Long-Term Debt and Liquidity Matters [Line Items] |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  | $ 100,000,000 | $ 50,000,000 |  |  |  |  |  |  |

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