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Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivative [Line Items]    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Investments Other Investments
Asset Derivatives $ 60 $ 88
Derivative assets 30 57
Gross Amounts of Recognized (Liabilities) (62) (43)
Derivative Liability (32) (12)
Other liabilities    
Derivative [Line Items]    
Derivative, Collateral, Obligation to Return Cash (10) (11)
Gross Amounts of Recognized (Liabilities) (62) (43)
Gross Amounts Offset in the Statement of Financial Position, liabilities (40) (42)
Derivative Liability (32) (12)
Financial Collateral (Received) (20) (1)
Net amount, liabilities (2) 0
Other investments    
Derivative [Line Items]    
Asset Derivatives 60 88
Gross Amounts Offset in the Statement of Financial Position, assets 58 86
Derivative assets 30 57
Derivative, Collateral, Obligation to Return Cash 28 55
Financial Collateral Pledged 0 0
Net Amount, assets $ 2 $ 2