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Fair Value of Financial Assets and Liabilities - Consideration of Credit Risk and Concentrations (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Counterparty
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Counterparty
Sep. 30, 2021
USD ($)
Consideration of Credit Risk and Concentrations [Abstract]        
Derivative instruments designated as fair value hedges $ 0 $ 0 $ 0 $ 0
Other Derivative Instruments        
Consideration of Credit Risk and Concentrations [Abstract]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0 0 0 0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities) 0 0 (2) 6
Pre-tax gains (losses) recognized during the period in income 2 11 (8) 19
Designated as Hedging Instrument | Cash Flow Hedges        
Consideration of Credit Risk and Concentrations [Abstract]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 1   1 1
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities) 0   0 0
Pre-tax gains (losses) recognized during the period in income 0   0 0
Natural Gas Commodity        
Consideration of Credit Risk and Concentrations [Abstract]        
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities 4 37 2 36
Natural Gas Commodity | Other Derivative Instruments        
Consideration of Credit Risk and Concentrations [Abstract]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net     0 0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities) [1]     (2) 6
Pre-tax gains (losses) recognized during the period in income [1],[2]     (11) (6)
Commodity Trading | Other Derivative Instruments        
Consideration of Credit Risk and Concentrations [Abstract]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0 0 0 0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities) 0 0 0 0
Pre-tax gains (losses) recognized during the period in income [3] 2 $ 11 3 25
Interest Rate | Designated as Hedging Instrument | Cash Flow Hedges        
Consideration of Credit Risk and Concentrations [Abstract]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [4] 1   1 1
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities) 0   0 0
Pre-tax gains (losses) recognized during the period in income $ 0   $ 0 $ 0
Credit Concentration Risk        
Consideration of Credit Risk and Concentrations [Abstract]        
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty 10   10  
Credit Concentration Risk | Municipal or Cooperative Entities or Other Utilities [Member]        
Consideration of Credit Risk and Concentrations [Abstract]        
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty 6   6  
Credit Concentration Risk | External Credit Rating, Investment Grade [Member]        
Consideration of Credit Risk and Concentrations [Abstract]        
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty 4   4  
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties $ 53   $ 53  
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths) 45.00%   45.00%  
Credit Concentration Risk | No Investment Grade Ratings from External Credit Rating Agencies [Member]        
Consideration of Credit Risk and Concentrations [Abstract]        
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty 4   4  
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties $ 26   $ 26  
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths) 22.00%   22.00%  
Credit Concentration Risk | External Credit Rating, Non Investment Grade [Member]        
Consideration of Credit Risk and Concentrations [Abstract]        
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty 2   2  
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties $ 16   $ 16  
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths) 13.00%   13.00%  
[1] Recorded to cost of natural gas sold and transported. These losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.
[2] Relates primarily to option premium amortization.
[3] Recorded to electric operating revenues. Portions of these gains and losses are subject to sharing with electric customers through margin-sharing mechanisms and deducted from gross revenue as appropriate.
[4] Recorded to interest charges.