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Derivative Accounting - Additional Information (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Derivative [Line Items]  
Amounts reclassified from accumulated other comprehensive income $ 0
ARIZONA PUBLIC SERVICE COMPANY  
Derivative [Line Items]  
Percentage of unrealized gains and losses on certain derivatives deferred for future rate treatment before accounting treatment change 100.00%
Commodity Contracts  
Derivative [Line Items]  
Aggregate fair value of derivative instruments in a net liability position $ 21,605,000
Additional collateral to counterparties for energy related non-derivative instrument contracts $ 90,000,000
Risk Management Assets | Credit Concentration Risk  
Derivative [Line Items]  
Concentration risk, percentage 62.00%
Aggregate fair value of derivative instruments in a net liability position $ 5,000,000