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Palo Verde Sale Leaseback Variable Interest Entities - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) power_plant | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Lease power_plant | Jun. 30, 2017 USD ($) | Dec. 31, 1986 Trust
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts | $ 4,874,000 | $ 4,874,000 | $ 9,747,000 | $ 9,747,000 |
APS |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Number of VIE lessor trusts | 3 |  | 3 |  | 3
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts | $ 4,874,000 | 4,874,000 | $ 9,747,000 | 9,747,000 |
APS | Consolidation of VIEs |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts | $ 5,000,000 | $ 5,000,000 | 10,000,000 | $ 10,000,000 |
Initial loss exposure to the VIE's noncontrolling equity participants during lease extension period |  |  | 295,000,000 |  |
Maximum loss exposure to the VIE's noncontrolling equity participants during lease extension period |  |  | $ 456,000,000 |  |
APS | Consolidation of VIEs | Through 2023 |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Number of leases under which assets are retained | Lease |  |  | 1 |  |
APS | Consolidation of VIEs | Through 2033 |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Number of leases under which assets are retained | Lease |  |  | 2 |  |
APS | Consolidation of VIEs | Period 2017 through 2023 |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Annual lease payments |  |  | $ 23,000,000 |  |
APS | Consolidation of VIEs | Period 2024 through 2033 |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Annual lease payments |  |  | $ 16,000,000 |  |
APS | Consolidation of VIEs | Period 2024 through 2033 | Maximum |  |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |  |
Lease period (up to) |  |  | 2 years |  |

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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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