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Palo Verde Sale Leaseback Variable Interest Entities - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
powerPlant
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
powerPlant
lease
Sep. 30, 2020
USD ($)
Dec. 31, 1986
trust
Palo Verde Sale Leaseback Variable Interest Entities          
Net income attributable to noncontrolling interests $ 4,306,000 $ 4,873,000 $ 12,918,000 $ 14,620,000  
APS          
Palo Verde Sale Leaseback Variable Interest Entities          
Number of VIE lessor trusts 3   3   3
Net income attributable to noncontrolling interests $ 4,306,000 4,873,000 $ 12,918,000 14,620,000  
Palo Verde VIE | APS          
Palo Verde Sale Leaseback Variable Interest Entities          
Net income attributable to noncontrolling interests $ 4,000,000 $ 5,000,000 13,000,000 $ 15,000,000  
Initial loss exposure to the VIE's noncontrolling equity participants during lease extension period     307,000,000    
Palo Verde VIE | APS | Maximum          
Palo Verde Sale Leaseback Variable Interest Entities          
Maximum loss exposure to the VIE's noncontrolling equity participants during lease extension period (up to)     $ 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