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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Derivative Assets [Abstract]    
Derivative Fair Value Of Free Standing Derivative Asset $ 307 $ 137
Gross Amounts Offset in the Balance Sheet (55) (20)
Net Amounts Presented in the Balance Sheet 252 117
Derivative Asset, Fair Value of Collateral [1] 0 0
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received (247) (119)
Net Amount 5 (2)
Derivative Liabilities [Abstract]    
Derivative Fair Value Of Free Standing Derivative Liability 179 73
Gross Amounts Offset in the Balance Sheet (55) (20)
Net Amounts Presented in the Balance Sheet 124 53
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments [1] (127) (92)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received (115) (52)
Net Amount $ (118) $ (91)
[1]
Includes initial margin posted to a central clearing partner.