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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, 2022
Sep. 30, 2021
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities, subject to master netting or similar arrangements $ 53  
Gross Amounts Offset in the Balance Sheet 45  
Total derivatives not subject to master netting or similar arrangement 7 $ 3
Derivative Liability, Subject to Master Netting Arrangement, after Offset 1,160 1,725
Derivative Asset, Subject to Master Netting Arrangement, after Offset 275 250
Commodity contract derivatives 152 250
Derivative Liability, Fair Value of Collateral 68  
Currency Swap    
Offsetting Liabilities [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 240 83 [1]
Interest Rate Contract    
Offsetting Liabilities [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 905 1,639 [1]
Other Contract    
Offsetting Liabilities [Line Items]    
Derivative Asset, Subject to Master Netting Arrangement, after Offset   250
Commodity Contract under FHP    
Offsetting Liabilities [Line Items]    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 8 0
Derivative Asset, Subject to Master Netting Arrangement, after Offset 123 0
Letter of Credit    
Offsetting Liabilities [Line Items]    
Amount of letters of credit outstanding $ 704 $ 1,200
[1] Letters of credit of approximately $704 million and $1.2 billion were posted as collateral at September 30, 2022 and 2021, respectively, to partially secure the liability positions of one of the interest rate swaps in accordance with the collateral requirements for this derivative.