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Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Derivative [Line Items]    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other investments Other investments
Asset Derivatives $ 57 $ 62
Derivative assets (1) 34
Gross Amounts of Recognized (Liabilities) (50) (15)
Derivative liabilities 8 13
Derivative Liabilities    
Derivative [Line Items]    
Derivative, Collateral, Obligation to Return Cash (22) (21)
Gross Amounts of Recognized (Liabilities) (50) (15)
Gross Amounts Offset in the Statement of Financial Position, liabilities (36) (7)
Derivative liabilities 8 13
Financial Collateral (Received) (13) (7)
Net amount, liabilities (1) (1)
Derivative Assets    
Derivative [Line Items]    
Asset Derivatives 57 62
Gross Amounts Offset in the Statement of Financial Position, assets 55 60
Derivative assets (1) 34
Derivative, Collateral, Obligation to Return Cash 3 (32)
Financial Collateral Pledged 0 0
Net Amount, assets $ 2 $ 2