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Risk Management Activities and Derivative Transactions Offsetting of Derivative Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Sep. 30, 2022
Offsetting Assets [Line Items]    
Gross amounts of recognized liabilities $ 1,412 $ 1,160
Total derivatives not subject to master netting or similar arrangement 25 152
Amount of letters of credit outstanding for credit facilities 6  
Forward Contract Derivative Asset, at Fair Value 10 4
Derivative Liability, Not Subject to Master Netting Arrangement 16 7
Derivative Asset, Fair Value, Gross Liability 31 275
Offsetting Derivative Assets [Abstract]    
Derivative, Fair Value, Amount Offset Against Collateral, Net 30  
Letter of Credit    
Offsetting Assets [Line Items]    
Amount of letters of credit outstanding for credit facilities 569 704
Currency Swap    
Offsetting Assets [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 166 240
Interest Rate Contract    
Offsetting Assets [Line Items]    
Gross amounts of recognized liabilities 951 905
Commodity Contract under FHP    
Offsetting Assets [Line Items]    
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement 309  
Total derivatives not subject to master netting or similar arrangement 6 123
Derivative Asset, Subject to Master Netting Arrangement, after Offset 6 123
Derivative Liability, Not Subject to Master Netting Arrangement 279 8
Derivative Liability, Subject to Master Netting Arrangement, after Offset 279 8
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement 36  
Fair Value, Inputs, Level 2    
Offsetting Assets [Line Items]    
Forward Contract Derivative Asset, at Fair Value 10 4
Fair Value, Inputs, Level 2 | Commodity Contract under FHP    
Offsetting Assets [Line Items]    
Total derivatives not subject to master netting or similar arrangement 6 123
Derivative Liability, Not Subject to Master Netting Arrangement $ 279 $ 8