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Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Asset Derivatives $ 21 $ 33
Derivative assets 2 23
Gross Amounts of Recognized (Liabilities) (57) (94)
Derivative Liability (38) (84)
Derivative, Collateral, Right to Reclaim Cash 2 0
Other liabilities    
Derivative [Line Items]    
Derivative, Collateral, Obligation to Return Cash 12 4
Gross Amounts of Recognized (Liabilities) (57) (94)
Gross Amounts Offset in the Statement of Financial Position, liabilities (7) (6)
Derivative Liability (38) (84)
Derivative, Collateral, Obligation to Return Cash (12) (4)
Financial Collateral (Received) (48) (83)
Net amount, liabilities (2) (5)
Other investments    
Derivative [Line Items]    
Asset Derivatives 21 33
Gross Amounts Offset in the Statement of Financial Position, assets 18 31
Derivative assets 2 23
Derivative, Collateral, Obligation to Return Cash (1) 21
Financial Collateral Pledged 3 1
Net Amount, assets 0 1
Derivative, Collateral, Obligation to Return Cash $ 1 $ (21)