Investments (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Gain (Loss) on Investments
Largest single common stock holding	$ 597	$ 862
Largest equity holdings to total equity portfolio	6.30%	7.90%
Largest equity holdings to total portfolio	2.70%	3.50%
Assets Held by Insurance Regulators	$ 107	$ 119
Collateral at fair value	135	116
Fair Value of Owned Common Equities Held in Trust Account	101	84
Equity Securities at Fair Value	9,841	11,315
Debt Securities, Available-for-Sale, Allowance for Credit Loss	1
Changes in Allowance for Credit Losses During Period	$ 1
Maximum
Gain (Loss) on Investments
Debt Securities, Available-for-Sale, Allowance for Credit Loss		0
Changes in Allowance for Credit Losses During Period		$ 0
Fixed Maturities
Gain (Loss) on Investments
Number of securities below 70 percent of amortized cost	49	0	0
Number Of Impaired Securities Intended to be Sold | security	3	5	14
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss 3	$ 908	$ 16	$ 10
Number Of Securities Continuous Unrealized Loss Position | security	3,272	278	128