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Commitments and Contingencies - Palo Verde Nuclear Generating Station and Contractual Obligations (Details) |  |  | 12 Months Ended | 84 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 11, 2020 USD ($) | Oct. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) Trust | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2018 USD ($) claim | Dec. 31, 1986 Trust
Fuel and Purchased Power Commitments and Purchase Obligations [Abstract] |  |  |  |  |  |  |
Total obligation |  |  | $ 165,695,000 | $ 212,785,000 |  |  |
ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |
Palo Verde Nuclear Generating Station [Abstract] |  |  |  |  |  |  |
Maximum insurance against public liability per occurrence for a nuclear incident |  |  | 13,900,000,000 |  |  |  |
Maximum available nuclear liability insurance |  |  | 450,000,000 |  |  |  |
Remaining nuclear liability insurance through mandatory industry wide retrospective assessment program |  |  | 13,500,000,000 |  |  |  |
Maximum assessment per reactor for each nuclear incident |  |  | 137,600,000 |  |  |  |
Annual limit per incident with respect to maximum assessment |  |  | $ 20,500,000 |  |  |  |
Number of VIE lessor trusts | Trust |  |  | 3 |  |  |  | 3
Maximum potential retrospective assessment per incident of APS |  |  | $ 120,100,000 |  |  |  |
Annual payment limitation with respect to maximum potential retrospective assessment |  |  | 17,900,000 |  |  |  |
Amount of "all risk" (including nuclear hazards) insurance for property damage to, and decontamination of, property at Palo Verde |  |  | 2,800,000,000 |  |  |  |
Request second-year energy price for exported energy |  |  | $ 25,500,000 |  |  |  |
Period to provide collateral assurance based on rating triggers |  |  | 20 days |  |  |  |
Collateral assurance based on rating triggers |  |  | $ 73,400,000 |  |  |  |
Fuel and Purchased Power Commitments and Purchase Obligations [Abstract] |  |  |  |  |  |  |
2020 |  |  | 590,000,000 |  |  |  |
2021 |  |  | 613,000,000 |  |  |  |
2022 |  |  | 624,000,000 |  |  |  |
2023 |  |  | 616,000,000 |  |  |  |
2024 |  |  | 581,000,000 |  |  |  |
Thereafter |  |  | 5,500,000,000 |  |  |  |
Total obligation |  |  | 165,695,000 | 212,785,000 |  |  |
ARIZONA PUBLIC SERVICE COMPANY | Coal take-or-pay commitments |  |  |  |  |  |  |
Fuel and Purchased Power Commitments and Purchase Obligations [Abstract] |  |  |  |  |  |  |
2020 |  |  | 185,347,000 |  |  |  |
2021 |  |  | 186,554,000 |  |  |  |
2022 |  |  | 187,400,000 |  |  |  |
2023 |  |  | 189,120,000 |  |  |  |
2024 |  |  | 193,192,000 |  |  |  |
Thereafter |  |  | 1,240,964,000 |  |  |  |
Total obligation |  |  | 2,200,000,000 |  |  |  |
Present value of commitments |  |  | 1,600,000,000 |  |  |  |
Total purchases |  |  | 204,888,000 | 206,093,000 | $ 165,220,000 |  |
ARIZONA PUBLIC SERVICE COMPANY | Renewable energy credits |  |  |  |  |  |  |
Fuel and Purchased Power Commitments and Purchase Obligations [Abstract] |  |  |  |  |  |  |
2020 |  |  | 36,000,000 |  |  |  |
2021 |  |  | 35,000,000 |  |  |  |
2022 |  |  | 31,000,000 |  |  |  |
2023 |  |  | 30,000,000 |  |  |  |
2024 |  |  | 28,000,000 |  |  |  |
Thereafter |  |  | 133,000,000 |  |  |  |
ARIZONA PUBLIC SERVICE COMPANY | Coal Mine Reclamation Obligations |  |  |  |  |  |  |
Fuel and Purchased Power Commitments and Purchase Obligations [Abstract] |  |  |  |  |  |  |
2020 |  |  | 17,000,000 |  |  |  |
2021 |  |  | 16,000,000 |  |  |  |
2022 |  |  | 17,000,000 |  |  |  |
2023 |  |  | 18,000,000 |  |  |  |
2024 |  |  | 19,000,000 |  |  |  |
Thereafter |  |  | 88,000,000 |  |  |  |
ARIZONA PUBLIC SERVICE COMPANY | Coal Mine Reclamation Balance Sheet Obligations |  |  |  |  |  |  |
Fuel and Purchased Power Commitments and Purchase Obligations [Abstract] |  |  |  |  |  |  |
Total obligation |  |  | $ 166,000,000 | $ 213,000,000 |  |  |
Arizona Public Service Company and Palo Verde Owners vs. United States Department of Energy - Spent Nuclear Fuel and Waste Disposal |  |  |  |  |  |  |
Palo Verde Nuclear Generating Station [Abstract] |  |  |  |  |  |  |
Settlement amount, awarded to company |  | $ 16,000,000 |  |  |  | $ 84,300,000 |
Arizona Public Service Company and Palo Verde Owners vs. United States Department of Energy - Spent Nuclear Fuel and Waste Disposal | ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |
Palo Verde Nuclear Generating Station [Abstract] |  |  |  |  |  |  |
Settlement amount, awarded to company |  | $ 4,700,000 |  |  |  | $ 24,500,000 |
Gain contingency, new claims filed, number | claim |  |  |  |  |  | 5 |
Subsequent Event | Arizona Public Service Company and Palo Verde Owners vs. United States Department of Energy - Spent Nuclear Fuel and Waste Disposal |  |  |  |  |  |  |
Palo Verde Nuclear Generating Station [Abstract] |  |  |  |  |  |  |
Settlement amount, awarded to company | $ 15,400,000 |  |  |  |  |  |
Subsequent Event | Arizona Public Service Company and Palo Verde Owners vs. United States Department of Energy - Spent Nuclear Fuel and Waste Disposal | ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |
Palo Verde Nuclear Generating Station [Abstract] |  |  |  |  |  |  |
Settlement amount, awarded to company | $ 4,500,000 |  |  |  |  |  |

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