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Commodity Derivatives (Details)
MWh in Millions, MMBTU in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2023
USD ($)
MWh
MMBTU
Mar. 31, 2022
USD ($)
Dec. 31, 2022
MMBTU
MWh
Other Derivative Instruments      
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract]      
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities $ (89) $ 5  
Electric Commodity [Member]      
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract]      
Derivative, Nonmonetary Notional Amount | MWh [1],[2] 41   61
Cash Flow Hedges      
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract]      
Derivative Instruments in Hedges, at Fair Value, Net $ 0    
Natural Gas Commodity      
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract]      
Derivative, Nonmonetary Notional Amount | MMBTU [1],[2] 117   131
Natural Gas Commodity | Other Derivative Instruments      
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract]      
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities $ 3 $ 4  
[1] Not reflective of net positions in the underlying commodities.
[2] Notional amounts for options included on a gross basis but weighted for the probability of exercise.