Reinsurance (Funds Withheld) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Reinsurance Funds Withheld Assets [Line Items]
Funds withheld at interest	$ 5,556	$ 5,683
Fixed Maturities [Member]
Reinsurance Funds Withheld Assets [Line Items]
Funds withheld at interest	2,326	2,442
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	429	451
Funds withheld at interest
Reinsurance Funds Withheld Assets [Line Items]
Funds withheld at interest	1,496	1,545
Partnership
Reinsurance Funds Withheld Assets [Line Items]
Funds withheld at interest	35	35
Short-term Investments [Member]
Reinsurance Funds Withheld Assets [Line Items]
Funds withheld at interest	34	30
Accrued Income Receivable
Reinsurance Funds Withheld Assets [Line Items]
Funds withheld at interest	27	28
Other Assets
Reinsurance Funds Withheld Assets [Line Items]
Funds withheld at interest	0	1
Assets
Reinsurance Funds Withheld Assets [Line Items]
Funds withheld at interest	$ 4,349	$ 4,534