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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, 2023
Sep. 30, 2022
Offsetting Liabilities [Line Items]    
Gross Amounts Offset in the Balance Sheet $ 26  
Amount of letters of credit outstanding 6  
Derivative Liability, Subject to Master Netting Arrangement, after Offset 991 $ 1,160
Derivative Asset, Subject to Master Netting Arrangement, after Offset 37 275
Commodity contract derivatives 33 152
Currency Swap    
Offsetting Liabilities [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 141 240
Commodity Contract under FHP    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities, subject to master netting or similar arrangements 212  
Derivative Liability, Subject to Master Netting Arrangement, after Offset 186 8
Derivative Asset, Subject to Master Netting Arrangement, after Offset 0 123
Interest Rate Swap    
Offsetting Liabilities [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 662 905
Derivative Asset, Subject to Master Netting Arrangement, after Offset 4 0
Commodity Contract Derivatives    
Offsetting Liabilities [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 2 7
Derivative Asset, Subject to Master Netting Arrangement, after Offset 33 152
Letter of Credit    
Offsetting Liabilities [Line Items]    
Amount of letters of credit outstanding $ 535 $ 704