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Consideration of Credit Risk and Concentrations (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Counterparty
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Counterparty
Sep. 30, 2024
USD ($)
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 0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities 5 (6) 26 38
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities) (1) (13) (22) (16)
Pre-tax gains (losses) recognized during the period in income 2 3 (18) (33)
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 13   27 41
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities) [1] (1) (13) (22) (16)
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 0 0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities (8) (6) (1) (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 [2] 2 3 (5) (19)
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 [3],[4]     (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     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) (3) (3)
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     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 [5] $ (1) $ (1) $ (3) $ (3)
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 $ 21   $ 21  
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths) 12.00%   12.00%  
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 $ 85   $ 85  
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths) 51.00%   51.00%  
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 $ 28   $ 28  
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths) 17.00%   17.00%  
[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] Recorded to electric revenues. Presented amounts do not reflect non-derivative transactions or margin sharing with customers.
[3] 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.
[4] Relates primarily to option premium amortization.
[5] Recorded to interest charges.