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Palo Verde Sale Leaseback Variable Interest Entities - Narrative (Details) | 3 Months Ended |
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Mar. 31, 2018 USD ($) power_plant Lease | Mar. 31, 2017 USD ($) | Dec. 31, 1986 Trust
Palo Verde Sale Leaseback Variable Interest Entities |  |  |
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts | $ 4,873,000 | $ 4,873,000 |
Arizona Public Service Company |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |
Number of VIE lessor trusts | 3 |  | 3
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts | $ 4,873,000 | 4,873,000 |
Arizona Public Service Company | 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 |
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 |  |
Arizona Public Service Company | Consolidation of VIEs | Through 2023 |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |
Number of leases under which assets are retained | Lease | 1 |  |
Arizona Public Service Company | Consolidation of VIEs | Through 2033 |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |
Number of leases under which assets are retained | Lease | 2 |  |
Arizona Public Service Company | Consolidation of VIEs | Period 2017 through 2023 |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |
Annual lease payments | $ 23,000,000 |  |
Arizona Public Service Company | Consolidation of VIEs | Period 2024 through 2033 |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |
Annual lease payments | $ 16,000,000 |  |
Arizona Public Service Company | 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 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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- Definition Represents the number of leases under which assets are retained through a specified period. + References No definition available. + Details
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- Definition Variable Interest Entity, Entity Initial Loss Exposure to Noncontrolling Interests During Lease Extension Period, Amount + References No definition available. + Details
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- Definition Variable Interest Entity, Entity Maximum Loss Exposure to Noncontrolling Interests During Lease Extension Period, Amount + References No definition available. + Details
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- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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- Definition The yearly payments due under the 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77913982&loc=d3e50796-112755 + Details
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