v3.25.2
Credit Related Contingent Features (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Counterparty
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Counterparty
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Fair Value Disclosures [Abstract]          
Derivative, Gross Liability with Cross Default Position, Aggregate Fair Value $ 56   $ 56   $ 63
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, Gross Liability with Cross Default Position, Aggregate Fair Value 56   56   63
Collateral Already Posted Adequate Assurance Clauses Aggregate Fair Value 0   0   0
Derivative, Net Liability Position, Aggregate Fair Value $ 9   $ 9   $ 11
Credit Concentration Risk          
Derivative [Line Items]          
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty 7   7    
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 3   3    
Wholesale, trading and non trading commodity credit exposure for the most significant counterparties $ 22   $ 22    
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 3   3    
Wholesale, trading and non trading commodity credit exposure for the most significant counterparties $ 29   $ 29    
Percentage of wholesale, trading and non trading commodity credit exposure for the most significant counterparties 34.00%   34.00%    
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 1   1    
Wholesale, trading and non trading commodity credit exposure for the most significant counterparties $ 31   $ 31    
Percentage of wholesale, trading and non trading commodity credit exposure for the most significant counterparties 37.00%   37.00%    
Other Derivative Instruments          
Derivative [Line Items]          
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) $ 2 2 $ 8 6  
Pre-tax gains (losses) recognized during the period in income 4 (14) (12) (18)  
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities (2) 0 (4) 4  
Commodity Trading Contract | Other Derivative Instruments          
Derivative [Line Items]          
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] 4 (14) (8) (13)  
Electric Commodity | Other Derivative Instruments          
Derivative [Line Items]          
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) [2] (2) (2) (8) (6)  
Pre-tax gains (losses) recognized during the period in income 0 0 0 0  
Natural Gas Commodity | Other Derivative Instruments          
Derivative [Line Items]          
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 [3],[4]     (4) (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   0 1 3  
Electric commodity | Other Derivative Instruments          
Derivative [Line Items]          
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities $ (2) $ 0 $ (5) $ 1  
[1]
(a)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