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Credit Related Contingent Features (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
Counterparty
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Fair Value Disclosures [Abstract]      
Derivative instruments in a gross liability position $ 4   $ 3
Derivative, Gross Liability with Cross Default Position, Aggregate Fair Value 83   48
Collateral posted related to adequate assurance clauses in derivative contracts 0   0
Derivative [Line Items]      
Fair Value Hedges, Net 0 $ 0  
Derivative instruments in a gross liability position 4   3
Derivative, Gross Liability with Cross Default Position, Aggregate Fair Value $ 83   $ 48
Credit Concentration Risk      
Derivative [Line Items]      
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty 10    
Credit Concentration Risk | Municipal or Cooperative Entities or Other Utilities [Member]      
Derivative [Line Items]      
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty 4    
External Credit Rating, Investment Grade [Member] | Credit Concentration Risk      
Derivative [Line Items]      
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty 7    
Wholesale, trading and non trading commodity credit exposure for the most significant counterparties $ 46    
Percentage of wholesale, trading and non trading commodity credit exposure for the most significant counterparties 48.00%    
Internal Investment Grade [Member] | Credit Concentration Risk      
Derivative [Line Items]      
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty 1    
Wholesale, trading and non trading commodity credit exposure for the most significant counterparties $ 21    
Percentage of wholesale, trading and non trading commodity credit exposure for the most significant counterparties 22.00%    
External Credit Rating, Non Investment Grade [Member] | Credit Concentration Risk      
Derivative [Line Items]      
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty 2    
Wholesale, trading and non trading commodity credit exposure for the most significant counterparties $ 27    
Percentage of wholesale, trading and non trading commodity credit exposure for the most significant counterparties 28.00%    
Other Derivative Instruments      
Derivative [Line Items]      
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) 0 0  
Pre-tax gains (losses) recognized during the period in income (4) 28  
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss 0 0  
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities 2 1  
Commodity Trading Contract | Other Derivative Instruments      
Derivative [Line Items]      
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) 0 0  
Pre-tax gains (losses) recognized during the period in income [1] 1 31  
Electric Commodity | Other Derivative Instruments      
Derivative [Line Items]      
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) [2] 1 1  
Pre-tax gains (losses) recognized during the period in income 0 0  
Natural Gas Commodity | Other Derivative Instruments      
Derivative [Line Items]      
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) [3] (1) (1)  
Pre-tax gains (losses) recognized during the period in income [3],[4] (5) (3)  
Natural gas commodity | Other Derivative Instruments      
Derivative [Line Items]      
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss 0 0  
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities $ 2 $ 1  
[1] 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.
[2] Recorded to electric fuel and purchased power. These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate.
[3] Settlement losses related to natural gas operations are 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.
[4] Relates primarily to option premium amortization.