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Palo Verde Sale Leaseback Variable Interest Entities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Trust
Lease
Dec. 31, 2019
USD ($)
Dec. 31, 2018
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 $ 19,493 $ 19,493 $ 19,493  
ARIZONA PUBLIC SERVICE COMPANY        
Palo Verde Sale Leaseback Variable Interest Entities        
Number of VIE lessor trusts | Trust 3     3
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts $ 19,493 $ 19,493 19,493  
ARIZONA PUBLIC SERVICE COMPANY | Variable Interest Entity        
Palo Verde Sale Leaseback Variable Interest Entities        
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts     $ 19,000  
Initial loss exposure to the VIEs noncontrolling equity participants during lease extension period 306,000      
Maximum loss exposure to the VIE's noncontrolling equity participants during lease extension period $ 456,000      
Period Through 2023 | ARIZONA PUBLIC SERVICE COMPANY | Variable Interest Entity        
Palo Verde Sale Leaseback Variable Interest Entities        
Number of leases under which assets are retained | Lease 1      
Period Through 2033 | ARIZONA PUBLIC SERVICE COMPANY | Variable Interest Entity        
Palo Verde Sale Leaseback Variable Interest Entities        
Number of leases under which assets are retained | Lease 2      
Period 2021 through 2023 | ARIZONA PUBLIC SERVICE COMPANY | Variable Interest Entity        
Palo Verde Sale Leaseback Variable Interest Entities        
Annual lease payments $ 23,000      
Period 2024 through 2033 | ARIZONA PUBLIC SERVICE COMPANY | Variable Interest Entity        
Palo Verde Sale Leaseback Variable Interest Entities        
Annual lease payments $ 16,000      
Maximum | Period 2024 through 2033 | ARIZONA PUBLIC SERVICE COMPANY | Variable Interest Entity        
Palo Verde Sale Leaseback Variable Interest Entities        
Lease period 2 years