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Risk Management Activities and Derivative Transactions Offsetting of Derivative Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Sep. 30, 2024
Offsetting Assets [Line Items]    
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 116 $ 7
Amount of letters of credit outstanding for credit facilities 6  
Forward Contract Derivative Asset, at Fair Value 16 11
Derivative Liability, Subject to Master Netting Arrangement, after Offset 862 1,122
Offsetting Derivative Assets [Abstract]    
Derivative Asset, Fair Value, Gross Liability 16 4
Letter of Credit    
Offsetting Assets [Line Items]    
Amount of letters of credit outstanding for credit facilities 571 566
Currency Swap    
Offsetting Assets [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 139 116
Commodity Contract under FHP    
Offsetting Assets [Line Items]    
Derivative Asset, Subject to Master Netting Arrangement, after Offset 106 0
Derivative Liability, Subject to Master Netting Arrangement, after Offset 11 161
Offsetting Derivative Assets [Abstract]    
Derivative Asset, Subject to Master Netting Arrangement, before Offset 122 4
Gross amounts of recognized liabilities 27 165
Interest Rate Swap    
Offsetting Assets [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 707 840
Commodity Contract Derivatives    
Offsetting Assets [Line Items]    
Derivative Asset, Subject to Master Netting Arrangement, after Offset 10 7
Derivative Liability, Subject to Master Netting Arrangement, after Offset 5 5
Fair Value, Inputs, Level 2    
Offsetting Assets [Line Items]    
Forward Contract Derivative Asset, at Fair Value $ 16 $ 11