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Palo Verde Sale Leaseback Variable Interest Entities - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) power_plant | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) Lease power_plant | Sep. 30, 2019 USD ($) | Dec. 31, 1986 Trust
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Less: Comprehensive income attributable to noncontrolling interests | $ 4,873,000 | $ 4,873,000 | $ 14,620,000 | $ 14,620,000 |
APS |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Number of VIE lessor trusts | 3 |  | 3 |  | 3
Less: Comprehensive income attributable to noncontrolling interests | $ 4,873,000 | 4,873,000 | $ 14,620,000 | 14,620,000 |
Palo Verde VIE | APS |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Less: Comprehensive income attributable to noncontrolling interests | $ 5,000,000 | $ 5,000,000 | 15,000,000 | $ 15,000,000 |
Initial loss exposure to the VIE's noncontrolling equity participants during lease extension period |  |  | 304,000,000 |  |
Maximum loss exposure to the VIE's noncontrolling equity participants during lease extension period |  |  | $ 456,000,000 |  |
Palo Verde VIE | APS | Through 2023 |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Number of leases under which assets are retained | Lease |  |  | 1 |  |
Palo Verde VIE | APS | Through 2033 |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Number of leases under which assets are retained | Lease |  |  | 2 |  |
Palo Verde VIE | APS | Period 2017 through 2023 |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Annual lease payments |  |  | $ 23,000,000 |  |
Palo Verde VIE | APS | Period 2024 through 2033 |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Annual lease payments |  |  | $ 16,000,000 |  |
Palo Verde VIE | APS | Period 2024 through 2033 | Maximum |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Lease period (up to) |  |  | 2 years |  |

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