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Derivative Financial Instruments - Offsetting (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Derivative Financial Instruments    
Potential reduction in net position of total derivative assets $ 249 $ 194
Potential reduction in net position of total derivative liabilities 249 194
Cash collateral rehypothecated 0 0
Other receivables    
Derivative Financial Instruments    
Right to reclaim cash collateral 0 26
Accounts payable    
Derivative Financial Instruments    
Obligation to return cash collateral $ 2 $ 0