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Derivative Financial Instruments - Offsetting (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Derivative Financial Instruments    
Cash collateral rehypothecated $ 3 $ 8
Potential reduction in net position of total derivative liabilities 281 220
Potential reduction in net position of total derivative assets 281 220
Other receivables    
Derivative Financial Instruments    
Right to reclaim cash collateral 112 140
Accounts Payable    
Derivative Financial Instruments    
Obligation to return cash collateral $ 3 $ 8