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Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Asset Derivatives $ 33 $ 40
Derivative assets 23 12
Gross Amounts of Recognized (Liabilities) (94) (106)
Derivative liabilities (84) (78)
Derivative Liabilities    
Derivative [Line Items]    
Derivative, Collateral, Obligation to Return Cash (4) (5)
Gross Amounts of Recognized (Liabilities) (94) (106)
Gross Amounts Offset in the Statement of Financial Position, liabilities (6) (23)
Derivative liabilities (84) (78)
Financial Collateral (Received) (83) (73)
Net amount, liabilities (5) (10)
Derivative Assets    
Derivative [Line Items]    
Asset Derivatives 33 40
Gross Amounts Offset in the Statement of Financial Position, assets 31 37
Derivative assets 23 12
Derivative, Collateral, Obligation to Return Cash (21) (9)
Financial Collateral Pledged 1 1
Net Amount, assets $ 1 $ 2