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Derivative Accounting - Narrative (Details)
$ in Millions
Mar. 31, 2022
USD ($)
Commodity Contracts  
Derivative Accounting  
Additional collateral to counterparties for energy related non-derivative instrument contracts $ 77
Risk Management Assets | Credit Concentration Risk  
Derivative Accounting  
Risk management assets $ 298
Risk Management Assets | Credit Concentration Risk | Two Counterparties  
Derivative Accounting  
Concentration risk 27.00%
APS  
Derivative Accounting  
Percentage of unrealized gains and losses on certain derivatives deferred for future rate treatment 100.00%