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Risk Management Activities and Derivative Transactions Offsetting of Derivative Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Sep. 30, 2023
Offsetting Assets [Line Items]    
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 19 $ 37
Amount of letters of credit outstanding for credit facilities 6  
Forward Contract Derivative Asset, at Fair Value 5 11
Derivative Liability, Subject to Master Netting Arrangement, after Offset 1,149 991
Offsetting Derivative Assets [Abstract]    
Derivative Asset, Fair Value, Gross Liability 7  
Letter of Credit    
Offsetting Assets [Line Items]    
Amount of letters of credit outstanding for credit facilities 516 535
Currency Swap    
Offsetting Assets [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 125 141
Commodity Contract under FHP    
Offsetting Assets [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 267 186
Offsetting Derivative Assets [Abstract]    
Derivative Asset, Subject to Master Netting Arrangement, before Offset 7  
Gross amounts of recognized liabilities 274  
Interest Rate Swap    
Offsetting Assets [Line Items]    
Derivative Asset, Subject to Master Netting Arrangement, after Offset 1 4
Derivative Liability, Subject to Master Netting Arrangement, after Offset 753 662
Commodity Contract Derivatives    
Offsetting Assets [Line Items]    
Derivative Asset, Subject to Master Netting Arrangement, after Offset 18 33
Derivative Liability, Subject to Master Netting Arrangement, after Offset 4 2
Fair Value, Inputs, Level 2    
Offsetting Assets [Line Items]    
Forward Contract Derivative Asset, at Fair Value $ 5 $ 11