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Consideration of Credit Risk and Concentrations (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Counterparty
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Counterparty
Jun. 30, 2024
USD ($)
Impact of Derivative Activity [Abstract]        
Fair value hedges $ 0 $ 0 $ 0 $ 0
Other Derivative Instruments        
Impact of Derivative Activity [Abstract]        
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss 0 0   0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities 9 41 21 44
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities) (16) (15) (21) (3)
Pre-tax gains (losses) recognized during the period in income 6 (14) (20) (36)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred 0 0 0 0
Other Derivative Instruments | Electric Commodity        
Impact of Derivative Activity [Abstract]        
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss 0 0   0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities 9 42 14 41
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities) [1] (16) (15) (21) (3)
Pre-tax gains (losses) recognized during the period in income 0 0 0 0
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred 0 0 0 0
Other Derivative Instruments | Natural Gas Commodity        
Impact of Derivative Activity [Abstract]        
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   (1) 7 [2] 3
Other Derivative Instruments | Commodity Trading        
Impact of Derivative Activity [Abstract]        
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] 6 (14) (7) (22)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred 0 0 0 0
Other Derivative Instruments | Natural Gas Commodity        
Impact of Derivative Activity [Abstract]        
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],[5]     (13) (14)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred     0 0
Designated as Hedging Instrument | Cash Flow Hedges        
Impact of Derivative Activity [Abstract]        
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss 5   1 29
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities 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 0 0 0 0
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred (1) (1) (2) (2)
Designated as Hedging Instrument | Cash Flow Hedges | Interest Rate        
Impact of Derivative Activity [Abstract]        
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss 5   1 29
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities 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 0 0 0 0
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred [6] $ (1) $ (1) $ (2) $ (2)
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 7   7  
Credit Concentration Risk | External Credit Rating, Investment Grade [Member]        
Derivative [Line Items]        
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 $ 23   $ 23  
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths) 15.00%   15.00%  
Credit Concentration Risk | Internal Investment Grade [Member]        
Derivative [Line Items]        
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty 7   7  
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties $ 70   $ 70  
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths) 46.00%   46.00%  
Credit Concentration Risk | External Credit Rating, Non Investment Grade [Member]        
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 (in hundredths) 20.00%   20.00%  
[1] 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.
[2] Other than $2 million of 2025 losses recorded to electric fuel and purchased power, amounts are recorded to cost of natural gas sold and transported. Amounts are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.
[3] Recorded to electric revenues. Presented amounts do not reflect non-derivative transactions or margin sharing with customers.
[4] Other than $2 million of 2025 and 2024 losses recorded to electric fuel and purchased power, amounts are recorded to cost of natural gas sold and transported. Amounts are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.
[5] Relates primarily to option premium amortization.
[6] Recorded to interest charges.