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Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Offsetting of Derivative Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Offsetting Liabilities [Line Items]    
Gross Amounts Offset in the Balance Sheet $ 4 $ 26
Amount of letters of credit outstanding 6  
Derivative Liability, Subject to Master Netting Arrangement, after Offset 1,122 991
Derivative Asset, Subject to Master Netting Arrangement, after Offset 7 37
Commodity contract derivatives 7 33
Currency Swap    
Offsetting Liabilities [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 116 141
Commodity Contract under FHP    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities, subject to master netting or similar arrangements 165 212
Derivative Liability, Subject to Master Netting Arrangement, after Offset 161 186
Derivative Asset, Subject to Master Netting Arrangement, after Offset 0 0
Interest Rate Swap    
Offsetting Liabilities [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 840 662
Derivative Asset, Subject to Master Netting Arrangement, after Offset 0 4
Commodity Contract Derivatives    
Offsetting Liabilities [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 5 2
Derivative Asset, Subject to Master Netting Arrangement, after Offset 7 33
Letter of Credit    
Offsetting Liabilities [Line Items]    
Amount of letters of credit outstanding $ 566 535
Interest rate swap collateral [Member]    
Offsetting Liabilities [Line Items]    
Amount of letters of credit outstanding   $ 509