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Consideration of Credit Risk and Concentrations (Details)
$ in Millions
Dec. 31, 2025
USD ($)
Counterparty
Interest Rate Swap  
Derivative [Line Items]  
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | $ $ 0
Credit Concentration Risk  
Derivative [Line Items]  
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure 4
Credit Concentration Risk | Municipal or Cooperative Entities or Other Utilities  
Derivative [Line Items]  
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure 4
Credit Concentration Risk | External Credit Rating, Investment Grade  
Derivative [Line Items]  
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure 1
Wholesale, trading and non trading commodity credit exposure for the most significant counterparties | $ $ 2
Percentage of wholesale, trading and non trading commodity credit exposure for the most significant counterparties 10.00%
Credit Concentration Risk | External Credit Rating, Noninvestment Grade  
Derivative [Line Items]  
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure 0
Credit Concentration Risk | Internal Investment Grade  
Derivative [Line Items]  
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure 3
Wholesale, trading and non trading commodity credit exposure for the most significant counterparties | $ $ 21
Percentage of wholesale, trading and non trading commodity credit exposure for the most significant counterparties 85.00%