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Commitments and Contingencies - Palo Verde Nuclear Generating Station and Contractual Obligations (Details) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 01, 2015 USD ($) | Aug. 18, 2014 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) power_plant | Dec. 31, 1986 Trust
Breach of Contract for Disposal of Spent Nuclear Fuel and/or High Level Radioactive Waste |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Litigation settlement amount |  | $ 57,400,000 |  |  |
Proceeds from legal settlements | $ 42,000,000 |  |  |  |
Arizona Public Service Company |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Maximum insurance against public liability per occurrence for a nuclear incident (up to) |  |  |  | $ 13,400,000,000 |
Maximum available nuclear liability insurance (up to) |  |  |  | 375,000,000 |
Remaining nuclear liability insurance through mandatory industry wide retrospective assessment program |  |  |  | 12,980,000,000 |
Maximum retrospective premium assessment per reactor for each nuclear liability incident |  |  |  | 127,300,000 |
Annual limit per incident with respect to maximum retrospective premium assessment |  |  |  | $ 19,000,000 |
Number of VIE lessor trusts |  |  |  | 3 | 3
Maximum potential retrospective assessment per incident of APS |  |  |  | $ 111,000,000 |
Annual payment limitation with respect to maximum potential retrospective premium assessment |  |  |  | 16,500,000 |
Amount of "all risk" (including nuclear hazards) insurance for property damage to, and decontamination of, property at Palo Verde |  |  |  | 2,750,000,000 |
Maximum amount that APS could incur under the current NEIL policies for each retrospective assessment |  |  |  | 23,100,000 |
Collateral assurance provided based on rating triggers |  |  |  | $ 61,600,000 |
Period to provide collateral assurance based on rating triggers |  |  |  | 20 days |
Arizona Public Service Company | Breach of Contract for Disposal of Spent Nuclear Fuel and/or High Level Radioactive Waste |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Litigation settlement amount |  | $ 16,700,000 |  |  |
Proceeds from legal settlements | 12,200,000 |  |  |  |
Adjustment to regulatory liability | $ 12,200,000 |  |  |  |
Four Corners and Ocotillo Plant | Gas Generations Projects and Selective Catalytic Reduction Control Technologies |  |  |  |  |
Contractual Obligations |  |  |  |  |
2015 |  |  |  | $ 42,000,000 |
2016 |  |  |  | 269,000,000 |
2017 |  |  |  | 176,000,000 |
2018 |  |  |  | 42,000,000 |
Ocotillo Plant | Gas Generation Projects |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Increase in contractual obligations |  |  |  | 170,000,000 |
Four Corners | Selective Catalytic Reduction Control Technologies |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Increase in contractual obligations |  |  |  | $ 359,000,000 |
Forecast | Breach of Contract for Disposal of Spent Nuclear Fuel and/or High Level Radioactive Waste |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Proceeds from legal settlements |  |  | $ 12,000,000 |  |
Forecast | Arizona Public Service Company | Breach of Contract for Disposal of Spent Nuclear Fuel and/or High Level Radioactive Waste |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Proceeds from legal settlements |  |  | $ 3,500,000 |  |

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