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Derivatives - Derivatives included in the Balance Sheet at fair value (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Derivative assets $ 47 $ 54
Derivative liabilities 11 3
Interest rate swaps | Designated as hedging instrument    
Derivatives, Fair Value [Line Items]    
Derivative assets 1 1
Derivative liabilities $ 3 $ 3
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities
Fixed maturities with embedded derivatives | Not designated as hedging instrument    
Derivatives, Fair Value [Line Items]    
Derivative assets $ 46 $ 53
Derivative liabilities $ 0 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Fair Value  
Total return swap | Not designated as hedging instrument    
Derivatives, Fair Value [Line Items]    
Derivative assets $ 0 0
Derivative liabilities $ 8 $ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities