Investments (Fixed Maturity Securities Available-For-Sale by Sector) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 300,555	$ 306,025
Allowance for Credit Loss for Debt Securities	(184)	(183)	$ (91)
Gross Unrealized Gains	6,876	5,239
Gross Unrealized Losses	25,835	34,301
Estimated Fair Value of Fixed Maturity Securities AFS	281,412	276,780
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	85,563	88,466
Allowance for Credit Loss for Debt Securities	(68)	(29)	(30)
Gross Unrealized Gains	1,894	1,133
Gross Unrealized Losses	6,672	9,540
Estimated Fair Value of Fixed Maturity Securities AFS	80,717	80,030
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	59,123	59,696
Allowance for Credit Loss for Debt Securities	(2)	(5)	(28)
Gross Unrealized Gains	1,750	1,213
Gross Unrealized Losses	5,427	8,332
Estimated Fair Value of Fixed Maturity Securities AFS	55,444	52,572
Foreign government
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	48,260	50,047
Allowance for Credit Loss for Debt Securities	(88)	(130)	(19)
Gross Unrealized Gains	1,754	1,876
Gross Unrealized Losses	4,437	5,046
Estimated Fair Value of Fixed Maturity Securities AFS	45,489	46,747
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	35,374	35,658
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	590	431
Gross Unrealized Losses	3,712	3,860
Estimated Fair Value of Fixed Maturity Securities AFS	32,252	32,229
RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	31,479	29,496
Allowance for Credit Loss for Debt Securities	(1)	0	0
Gross Unrealized Gains	353	187
Gross Unrealized Losses	2,735	3,518
Estimated Fair Value of Fixed Maturity Securities AFS	29,096	26,165
ABS & CLO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,910	17,991
Allowance for Credit Loss for Debt Securities	(7)	0	0
Gross Unrealized Gains	54	23
Gross Unrealized Losses	663	1,192
Estimated Fair Value of Fixed Maturity Securities AFS	17,294	16,822
Municipals
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,991	13,548
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	408	317
Gross Unrealized Losses	1,228	1,713
Estimated Fair Value of Fixed Maturity Securities AFS	11,171	12,152
CMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,855	11,123
Allowance for Credit Loss for Debt Securities	(18)	(19)	$ (14)
Gross Unrealized Gains	73	59
Gross Unrealized Losses	961	1,100
Estimated Fair Value of Fixed Maturity Securities AFS	$ 9,949	$ 10,063