Investments (Fixed Maturity Securities Available-For-Sale by Sector) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 304,962	$ 306,025
Allowance for Credit Loss for Debt Securities	(193)	(183)	$ (355)	$ (91)
Gross Unrealized Gains	6,554	5,239
Gross Unrealized Losses	27,469	34,301
Estimated Fair Value of Fixed Maturity Securities AFS	283,854	276,780
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	88,625	88,466
Allowance for Credit Loss for Debt Securities	(63)	(29)	(13)	(30)
Gross Unrealized Gains	1,589	1,133
Gross Unrealized Losses	7,669	9,540
Estimated Fair Value of Fixed Maturity Securities AFS	82,482	80,030
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	59,903	59,696
Allowance for Credit Loss for Debt Securities	(2)	(5)	(102)	(28)
Gross Unrealized Gains	1,387	1,213
Gross Unrealized Losses	7,003	8,332
Estimated Fair Value of Fixed Maturity Securities AFS	54,285	52,572
Foreign government
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	49,804	50,047
Allowance for Credit Loss for Debt Securities	(117)	(130)	(226)	(19)
Gross Unrealized Gains	2,225	1,876
Gross Unrealized Losses	3,801	5,046
Estimated Fair Value of Fixed Maturity Securities AFS	48,111	46,747
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	35,183	35,658
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	531	431
Gross Unrealized Losses	2,836	3,860
Estimated Fair Value of Fixed Maturity Securities AFS	32,878	32,229
RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29,174	29,496
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	214	187
Gross Unrealized Losses	2,845	3,518
Estimated Fair Value of Fixed Maturity Securities AFS	26,543	26,165
ABS & CLO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,927	17,991
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	35	23
Gross Unrealized Losses	992	1,192
Estimated Fair Value of Fixed Maturity Securities AFS	16,970	16,822
Municipals
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,414	13,548
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	512	317
Gross Unrealized Losses	1,329	1,713
Estimated Fair Value of Fixed Maturity Securities AFS	12,597	12,152
CMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,932	11,123
Allowance for Credit Loss for Debt Securities	(11)	(19)	$ (14)	$ (14)
Gross Unrealized Gains	61	59
Gross Unrealized Losses	994	1,100
Estimated Fair Value of Fixed Maturity Securities AFS	$ 9,988	$ 10,063

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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