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Consideration of Credit Risk and Concentrations (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Counterparty
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Counterparty
Sep. 30, 2021
USD ($)
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 0 62,000,000 103,000,000 75,000,000
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) 6,000,000 3,000,000 (27,000,000) (18,000,000)
Pre-tax gains (losses) recognized during the period in income 13,000,000 1,000,000 4,000,000 39,000,000
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 0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities 6,000,000 5,000,000 106,000,000 18,000,000
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) [1] 6,000,000 3,000,000 (31,000,000) (26,000,000)
Pre-tax gains (losses) recognized during the period in income 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 (6,000,000) 57,000,000 (3,000,000) 57,000,000
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]     4,000,000 8,000,000
Pre-tax gains (losses) recognized during the period in income [2],[3]     (17,000,000) (10,000,000)
Other Derivative Instruments | Commodity Trading        
Impact of Derivative Activity [Abstract]        
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 [4] 13,000,000 1,000,000 21,000,000 49,000,000
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   4,000,000 21,000,000 5,000,000
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities   0 0 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 1,000,000 2,000,000 5,000,000 7,000,000
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
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   4,000,000 21,000,000 5,000,000
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities   0 0 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [5] 1,000,000 2,000,000 5,000,000 7,000,000
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
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 6   6  
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 5   5  
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties $ 86,000,000   $ 86,000,000  
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths) 30.00%   30.00%  
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 3   3  
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties $ 61,000,000   $ 61,000,000  
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths) 22.00%   22.00%  
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 2   2  
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties $ 68,000,000   $ 68,000,000  
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths) 24.00%   24.00%  
[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. All 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 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.
[3] Relates primarily to option premium amortization.
[4] 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.
[5] Recorded to interest charges.