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Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Derivative Assets [Abstract]    
Derivative Fair Value Of Free Standing Derivative Asset $ 177 $ 171
Gross Amounts Offset in the Balance Sheet (31) (31)
Net Amounts Presented in the Balance Sheet 146 140
Derivative Asset, Fair Value of Collateral [1] (36) (30)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received (100) (98)
Net Amount 10 12
Derivative Liabilities [Abstract]    
Derivative Fair Value Of Free Standing Derivative Liability 75 80
Gross Amounts Offset in the Balance Sheet (31) (31)
Net Amounts Presented in the Balance Sheet 44 49
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments [1] (121) (146)
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received (48) (47)
Net Amount $ (125) $ (144)
[1] Includes initial margin posted to a central clearing partner.