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Derivative Instruments - Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Derivative [Line Items]    
Asset Derivatives $ 33 $ 33
Derivative assets 22 23
Gross Amounts of Recognized (Liabilities) (66) (94)
Derivative Liability (55) (84)
Other liabilities    
Derivative [Line Items]    
Derivative, Collateral, Obligation to Return Cash 7 4
Gross Amounts of Recognized (Liabilities) (66) (94)
Gross Amounts Offset in the Statement of Financial Position, liabilities (4) (6)
Derivative Liability (55) (84)
Derivative, Collateral, Obligation to Return Cash (7) (4)
Financial Collateral (Received) (57) (83)
Net amount, liabilities (5) (5)
Other investments    
Derivative [Line Items]    
Asset Derivatives 33 33
Gross Amounts Offset in the Statement of Financial Position, assets 30 31
Derivative assets 22 23
Derivative, Collateral, Obligation to Return Cash 19 21
Financial Collateral Pledged 1 1
Net Amount, assets 2 1
Derivative, Collateral, Obligation to Return Cash $ (19) $ (21)