v3.26.3
Reinsurance (Funds Withheld) (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest $ 7,870 $ 8,149
Fixed Maturities [Member]    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 6,628 4,033
Equity securities    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 2 2
Mortgage Loans on Real Estate [Member]    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 1,061 821
Funds withheld at interest    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 1,307 1,360
Partnership    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 159 88
Short-term Investments [Member]    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 316 60
Other invested assets    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 142 0
Accrued Income Receivable    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 82 50
Assets    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 9,914 6,415
Net Assets, Segment    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest 0 1
Policy loans    
Reinsurance Funds Withheld Assets [Line Items]    
Funds withheld at interest $ 217 $ 0