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Derivative Financial Instruments - Offsetting (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Derivative Financial Instruments    
Potential reduction in net position of total derivative assets $ 91 $ 213
Potential reduction in net position of total derivative liabilities 91 213
Obligation to return cash collateral 24 0
Cash collateral rehypothecated 0 0
Other receivables    
Derivative Financial Instruments    
Right to reclaim cash collateral $ 0 $ 0