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Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Derivative [Line Items]    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Investments Other Investments
Asset Derivatives $ 68 $ 57
Derivative assets 31 (1)
Gross Amounts of Recognized (Liabilities) (56) (50)
Derivative Liability (19) 8
Other liabilities    
Derivative [Line Items]    
Derivative, Collateral, Obligation to Return Cash 1 22
Gross Amounts of Recognized (Liabilities) (56) (50)
Gross Amounts Offset in the Statement of Financial Position, liabilities (36) (36)
Derivative Liability (19) 8
Financial Collateral (Received) (18) (13)
Net amount, liabilities (2) (1)
Other investments    
Derivative [Line Items]    
Asset Derivatives 68 57
Gross Amounts Offset in the Statement of Financial Position, assets 62 55
Derivative assets 31 (1)
Derivative, Collateral, Obligation to Return Cash 25 (3)
Financial Collateral Pledged 0 0
Net Amount, assets $ 6 $ 2