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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Mar. 31, 2024
Bond_issues
Offsetting Liabilities [Line Items]      
Number of currency swaps outstanding | Bond_issues     2
Accounts Receivable, before Allowance for Credit Loss, Current $ 1,569 $ 1,683  
Amount of letters of credit outstanding 6    
Forward Contract Derivative Asset, at Fair Value 9 11  
Letter of Credit      
Offsetting Liabilities [Line Items]      
Amount of letters of credit outstanding 500 566  
Interest Swap Collateral      
Offsetting Liabilities [Line Items]      
Amount of letters of credit outstanding 469    
Fair Value, Inputs, Level 2      
Offsetting Liabilities [Line Items]      
Forward Contract Derivative Asset, at Fair Value $ 9 $ 11