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Risk Management Activities and Derivative Transactions Offsetting of Derivative Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Sep. 30, 2024
Offsetting Assets [Line Items]    
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 18 $ 7
Amount of letters of credit outstanding for credit facilities 6  
Forward Contract Derivative Asset, at Fair Value 9 11
Derivative Liability, Subject to Master Netting Arrangement, after Offset 858 1,122
Offsetting Derivative Assets [Abstract]    
Derivative Asset, Fair Value, Gross Liability 25 4
Letter of Credit    
Offsetting Assets [Line Items]    
Amount of letters of credit outstanding for credit facilities 500 566
Currency Swap    
Offsetting Assets [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 136 116
Commodity Contract under FHP    
Offsetting Assets [Line Items]    
Derivative Asset, Subject to Master Netting Arrangement, after Offset 6 0
Derivative Liability, Subject to Master Netting Arrangement, after Offset 81 161
Offsetting Derivative Assets [Abstract]    
Derivative Asset, Subject to Master Netting Arrangement, before Offset 31 4
Gross amounts of recognized liabilities 106 165
Interest Rate Swap    
Offsetting Assets [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 635 840
Commodity Contract Derivatives    
Offsetting Assets [Line Items]    
Derivative Asset, Subject to Master Netting Arrangement, after Offset 12 7
Derivative Liability, Subject to Master Netting Arrangement, after Offset 6 5
Fair Value, Inputs, Level 2    
Offsetting Assets [Line Items]    
Forward Contract Derivative Asset, at Fair Value $ 9 $ 11