v3.25.2
Consideration of Credit Risk and Concentrations (Details)
$ in Millions
Jun. 30, 2025
USD ($)
Counterparty
Jun. 30, 2024
USD ($)
Derivative [Line Items]    
Fair Value Hedges, Net | $ $ 0 $ 0
Credit Concentration Risk    
Derivative [Line Items]    
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure 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 4  
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 3  
Wholesale, trading and non trading commodity credit exposure for the most significant counterparties | $ $ 22  
Percentage of wholesale, trading and non trading commodity credit exposure for the most significant counterparties 27.00%  
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 3  
Wholesale, trading and non trading commodity credit exposure for the most significant counterparties | $ $ 29  
Percentage of wholesale, trading and non trading commodity credit exposure for the most significant counterparties 34.00%  
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 1  
Wholesale, trading and non trading commodity credit exposure for the most significant counterparties | $ $ 31  
Percentage of wholesale, trading and non trading commodity credit exposure for the most significant counterparties 37.00%