Investments (Fair Values And Unrealized Losses By Investment Category And By The Duration Of The Securities' Continuous Unrealized Loss Position) (Details) - Fixed Maturities - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Investments, Unrealized Loss Position
Less than 12 months fair value	$ 1,047	$ 406
Less than 12 Months, Unrealized losses	15	8
12 months or more fair value	28	54
12 Months or more, unrealized losses	1	2
Total fair value	1,075	460
Total Unrealized Losses	16	10
Corporate Securities
Investments, Unrealized Loss Position
Less than 12 months fair value	861	330
Less than 12 Months, Unrealized losses	13	5
12 months or more fair value	15	46
12 Months or more, unrealized losses	0	2
Total fair value	876	376
Total Unrealized Losses	13	7
States, Municipalities and Political Subdivisions
Investments, Unrealized Loss Position
Less than 12 months fair value	105	31
Less than 12 Months, Unrealized losses	2	2
12 months or more fair value	2	2
12 Months or more, unrealized losses	1	0
Total fair value	107	33
Total Unrealized Losses	3	2
Commercial Mortgage Backed Securities
Investments, Unrealized Loss Position
Less than 12 months fair value	10	23
Less than 12 Months, Unrealized losses	0	1
12 months or more fair value	11	6
12 Months or more, unrealized losses	0	0
Total fair value	21	29
Total Unrealized Losses	0	1
United States Government
Investments, Unrealized Loss Position
Less than 12 months fair value	48	12
Less than 12 Months, Unrealized losses	0	0
12 months or more fair value	0	0
12 Months or more, unrealized losses	0	0
Total fair value	48	12
Total Unrealized Losses	0	0
Foreign government
Investments, Unrealized Loss Position
Less than 12 months fair value	16	10
Less than 12 Months, Unrealized losses	0	0
12 months or more fair value	0	0
12 Months or more, unrealized losses	0	0
Total fair value	16	10
Total Unrealized Losses	0	0
Government-Sponsored Enterprises
Investments, Unrealized Loss Position
Less than 12 months fair value	7	0
Less than 12 Months, Unrealized losses	0	0
12 months or more fair value	0	0
12 Months or more, unrealized losses	0	0
Total fair value	7	0
Total Unrealized Losses	$ 0	$ 0