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Palo Verde Sale Leaseback Variable Interest Entities - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
power_plant
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
power_plant
Lease
Jun. 30, 2020
USD ($)
Dec. 31, 1986
Trust
Palo Verde Sale Leaseback Variable Interest Entities          
Net income attributable to noncontrolling interests $ 3,739,000 $ 4,874,000 $ 8,612,000 $ 9,747,000  
APS          
Palo Verde Sale Leaseback Variable Interest Entities          
Number of VIE lessor trusts 3   3   3
Net income attributable to noncontrolling interests $ 3,739,000 4,874,000 $ 8,612,000 9,747,000  
Palo Verde VIE | APS          
Palo Verde Sale Leaseback Variable Interest Entities          
Net income attributable to noncontrolling interests $ 4,000,000 $ 5,000,000 9,000,000 $ 10,000,000  
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