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Derivatives - Derivatives included in the Balance Sheet at fair value (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivatives, Fair Value [Line Items]    
Other assets $ 55 $ 82
Derivative liability 5 18
Interest rate swaps | Designated as hedging instrument    
Derivatives, Fair Value [Line Items]    
Other assets 1 1
Derivative liability $ 5 $ 14
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]    
Other assets $ 51 $ 81
Derivative liability $ 0 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Available for sale (AFS) fixed maturities  
Total return swap | Not designated as hedging instrument    
Derivatives, Fair Value [Line Items]    
Other assets $ 3 0
Derivative liability $ 0 $ 4
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities