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Credit Related Contingent Features (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Counterparty
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Counterparty
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Fair Value Disclosures [Abstract]          
Derivative instruments in a gross liability position $ 10   $ 10   $ 4
Derivative, Gross Liability with Cross Default Position, Aggregate Fair Value 76   76   76
Collateral posted related to adequate assurance clauses in derivative contracts 0   0   0
Derivative [Line Items]          
Fair Value Hedges, Net 0 $ 0 0 $ 0  
Derivative instruments in a gross liability position 10   10   4
Derivative, Gross Liability with Cross Default Position, Aggregate Fair Value 76   76   76
Collateral Already Posted Adequate Assurance Clauses Aggregate Fair Value $ 0   $ 0   $ 0
Credit Concentration Risk          
Derivative [Line Items]          
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]          
Derivative [Line Items]          
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty 4   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 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 27.00%   27.00%    
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 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 27.00%   27.00%    
External Credit Rating, Non Investment Grade [Member] | Credit Concentration Risk          
Derivative [Line Items]          
Wholesale, trading and non trading commodity credit exposure for the most significant counterparties $ 45   $ 45    
Percentage of wholesale, trading and non trading commodity credit exposure for the most significant counterparties 45.00%   45.00%    
Other Derivative Instruments          
Derivative [Line Items]          
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) 10 (2) 31 (3)  
Pre-tax gains (losses) recognized during the period in income (2) 11 (8) 12  
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities (22) 18 (48) 26  
Commodity Trading Contract | Other Derivative Instruments          
Derivative [Line Items]          
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 [1] (2) 11 (3) 17  
Electric Commodity | Other Derivative Instruments          
Derivative [Line Items]          
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) [2] (10) 2 31 (5)  
Pre-tax gains (losses) recognized during the period in income 0 0 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)     0 (2) [3]  
Pre-tax gains (losses) recognized during the period in income [3],[4]     (5) (5)  
Natural gas commodity | Other Derivative Instruments          
Derivative [Line Items]          
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities (3) (2) (1)    
Electric commodity | Other Derivative Instruments          
Derivative [Line Items]          
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities $ (19) $ 20 $ (47) $ 26  
[1] Recorded to electric revenues. Presented amounts do not reflect non-derivative transactions or margin sharing with customers.
[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. FTR settlements are shared with customers and do not have a material impact on net income. Presented amounts reflect changes in fair value between auction and settlement dates, but exclude the original auction fair value.
[3] 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.