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Palo Verde Sale Leaseback Variable Interest Entities - Narrative (Details)
3 Months Ended
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