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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details)
$ in Millions
Mar. 31, 2025
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2024
Bond_issues
Offsetting Liabilities [Line Items]      
Number of currency swaps outstanding | Bond_issues     2
Accounts Receivable, before Allowance for Credit Loss, Current $ 1,604 $ 1,683  
Amount of letters of credit outstanding 6    
Forward Contract Derivative Asset, at Fair Value 16 11  
Letter of Credit      
Offsetting Liabilities [Line Items]      
Amount of letters of credit outstanding 571 566  
Interest Swap Collateral      
Offsetting Liabilities [Line Items]      
Amount of letters of credit outstanding 465    
Fair Value, Inputs, Level 2      
Offsetting Liabilities [Line Items]      
Forward Contract Derivative Asset, at Fair Value $ 16 $ 11