Investments (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($)
Gain (Loss) on Investments
Largest single common stock holding	$ 862	$ 644
Largest equity holdings to total equity portfolio	7.90%	7.50%
Largest equity holdings to total portfolio	3.50%	3.00%
Assets Held by Insurance Regulators	$ 119	$ 121
Collateral at fair value	116	$ 98
Fair Value of Owned Common Equities Held in Trust Account	84
Impaired securities			3
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss			$ 3
Number of Impaired Securities with Allowance for Credit Losses		0
Equity Securities at Fair Value	$ 11,315	$ 8,856
Fixed Maturities
Gain (Loss) on Investments
Number of securities total unrealized loss in an unrealized loss position for 12 months or more			38
Number of securities below 70 percent of amortized cost	0	0	0
Number Of Impaired Securities Intended to be Sold | security	5	14
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss 3	$ 16	$ 10
Number Of Securities Continuous Unrealized Loss Position | security	278	128