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Derivative Accounting - Additional Information (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
Derivative [Line Items]  
Amounts reclassified from accumulated other comprehensive income $ 0
Commodity Contracts  
Derivative [Line Items]  
Aggregate fair value of derivative instruments in a net liability position 7,478,000
Additional collateral to counterparties for energy related non-derivative instrument contracts 88,000,000
Risk Management Assets | Credit Concentration Risk  
Derivative [Line Items]  
Aggregate fair value of derivative instruments in a net liability position $ 110,000,000
Risk Management Assets | Credit Concentration Risk | Four Counterparties  
Derivative [Line Items]  
Concentration risk, percentage 38.00%
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%