Investments (Fair Values And Unrealized Losses By Investment Category And By The Duration Of The Securities' Continuous Unrealized Loss Position) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Investments, Unrealized Loss Position
Total Unrealized Losses	$ 908	$ 16
Corporate Securities
Investments, Unrealized Loss Position
Total Unrealized Losses	580	13
States, Municipalities and Political Subdivisions
Investments, Unrealized Loss Position
Total Unrealized Losses	303	3
Commercial Mortgage Backed Securities
Investments, Unrealized Loss Position
Total Unrealized Losses	16	0
United States Government
Investments, Unrealized Loss Position
Total Unrealized Losses	5	0
Government-Sponsored Enterprises
Investments, Unrealized Loss Position
Total Unrealized Losses	3	0
Fixed Maturities
Investments, Unrealized Loss Position
Less than 12 months fair value	8,760	1,047
Less than 12 Months, Unrealized losses	706	15
12 months or more fair value	800	28
12 Months or more, unrealized losses	202	1
Total fair value	9,560	1,075
Total Unrealized Losses	908	16
Fixed Maturities | Corporate Securities
Investments, Unrealized Loss Position
Less than 12 months fair value	5,651	861
Less than 12 Months, Unrealized losses	412	13
12 months or more fair value	661	15
12 Months or more, unrealized losses	168	0
Total fair value	6,312	876
Total Unrealized Losses	580	13
Fixed Maturities | States, Municipalities and Political Subdivisions
Investments, Unrealized Loss Position
Less than 12 months fair value	2,600	105
Less than 12 Months, Unrealized losses	274	2
12 months or more fair value	77	2
12 Months or more, unrealized losses	29	1
Total fair value	2,677	107
Total Unrealized Losses	303	3
Fixed Maturities | Commercial Mortgage Backed Securities
Investments, Unrealized Loss Position
Less than 12 months fair value	215	10
Less than 12 Months, Unrealized losses	13	0
12 months or more fair value	14	11
12 Months or more, unrealized losses	3	0
Total fair value	229	21
Total Unrealized Losses	16	0
Fixed Maturities | United States Government
Investments, Unrealized Loss Position
Less than 12 months fair value	146	48
Less than 12 Months, Unrealized losses	3	0
12 months or more fair value	41	0
12 Months or more, unrealized losses	2	0
Total fair value	187	48
Total Unrealized Losses	5	0
Fixed Maturities | Government-Sponsored Enterprises
Investments, Unrealized Loss Position
Less than 12 months fair value	123	7
Less than 12 Months, Unrealized losses	3	0
12 months or more fair value	3	0
12 Months or more, unrealized losses	0	0
Total fair value	126	7
Total Unrealized Losses	3	0
Fixed Maturities | Foreign government
Investments, Unrealized Loss Position
Less than 12 months fair value	25	16
Less than 12 Months, Unrealized losses	1	0
12 months or more fair value	4	0
12 Months or more, unrealized losses	0	0
Total fair value	29	16
Total Unrealized Losses	$ 1	$ 0