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Palo Verde Sale Leaseback Variable Interest Entities - Narrative (Details) | 3 Months Ended |
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Mar. 31, 2021 USD ($) Lease power_plant | Mar. 31, 2020 USD ($) | Dec. 31, 1986 Trust
Palo Verde Sale Leaseback Variable Interest Entities |  |  |
Net income attributable to noncontrolling interests | $ 4,873,000 | $ 4,873,000 |
APS |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |
Number of VIE lessor trusts | 3 |  | 3
Net income attributable to noncontrolling interests | $ 4,873,000 | 4,873,000 |
Palo Verde VIE | APS |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |
Net income attributable to noncontrolling interests | 5,000,000 | $ 5,000,000 |
Initial loss exposure to the VIE's noncontrolling equity participants during lease extension period | 307,000,000 |  |
Maximum loss exposure to the VIE's noncontrolling equity participants during lease extension period | $ 501,000,000 |  |
Palo Verde VIE | APS | Period through 2023 |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |
Number of leases under which assets are retained | Lease | 1 |  |
Palo Verde VIE | APS | Period through 2033 |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |
Number of leases under which assets are retained | Lease | 2 |  |
Palo Verde VIE | APS | Period 2021 through 2033 |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |
Number of leases under which assets are retained | Lease | 3 |  |
Annual lease payments | $ 21,000,000 |  |
Palo Verde VIE | APS | Period 2021 through 2033 | Maximum |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |
Lease period (up to) | 2 years |  |

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- Definition Number of VIE lessor trusts with whom agreements have been made to sell and lease back interests in certain nuclear generating assets and related common facilities. + References No definition available. + Details
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- Definition Represents the period of lease entered into in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller. + References No definition available. + Details
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