Investments (Narrative) (Details) $ in Millions	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Gain (Loss) on Investments
Assets Held by Insurance Regulators	$ 108	$ 107
Collateral at fair value	125	135
Fair Value of Owned Common Equities Held in Trust Account	107	101
Equity Securities at Fair Value	10,989	9,841
Largest single common stock holding	$ 842	$ 597
Largest equity holdings to total equity portfolio	7.90%	6.30%
Largest equity holdings to total portfolio	3.40%	2.70%
Debt Securities, Available-for-Sale, Allowance for Credit Loss	$ 18	$ 1	$ 1
Fixed Maturities
Gain (Loss) on Investments
Number Of Securities Continuous Unrealized Loss Position | security	2,840	3,272	278
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss 3	$ 687	$ 908	$ 16
Number of securities below 70 percent of amortized cost	20	49	0