v3.26.1
Reinsurance (Funds Withheld Assets) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest $ 8,390 $ 8,149
Fixed Maturities [Member]    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 3,907 4,033
Equity securities    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 3 2
Mortgage Loans on Real Estate [Member]    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 753 821
Funds withheld at interest    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 1,345 1,360
Partnership    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 100 88
Short-term Investments [Member]    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 93 60
Accrued Income Receivable    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 49 50
Assets    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 6,251 6,415
Net Assets, Segment    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest $ 1 $ 1