Investments (Fixed Maturity Securities Available-For-Sale by Sector) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 300,623	$ 300,555
Allowance for Credit Loss for Debt Securities	(113)	(184)	$ (193)	$ (183)
Gross Unrealized Gains	6,021	6,876
Gross Unrealized Losses	28,122	25,835
Estimated Fair Value of Fixed Maturity Securities AFS	278,409	281,412
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	86,317	85,563
Allowance for Credit Loss for Debt Securities	(15)	(68)	(63)	(29)
Gross Unrealized Gains	1,706	1,894
Gross Unrealized Losses	7,455	6,672
Estimated Fair Value of Fixed Maturity Securities AFS	80,553	80,717
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	58,146	59,123
Allowance for Credit Loss for Debt Securities	(2)	(2)	(2)	(5)
Gross Unrealized Gains	1,704	1,750
Gross Unrealized Losses	5,819	5,427
Estimated Fair Value of Fixed Maturity Securities AFS	54,029	55,444
Foreign government
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	46,155	48,260
Allowance for Credit Loss for Debt Securities	(66)	(88)	(117)	(130)
Gross Unrealized Gains	1,478	1,754
Gross Unrealized Losses	4,774	4,437
Estimated Fair Value of Fixed Maturity Securities AFS	42,793	45,489
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	36,021	35,374
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	317	590
Gross Unrealized Losses	4,490	3,712
Estimated Fair Value of Fixed Maturity Securities AFS	31,848	32,252
RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	33,798	31,479
Allowance for Credit Loss for Debt Securities	(1)	(1)	0	0
Gross Unrealized Gains	317	353
Gross Unrealized Losses	2,972	2,735
Estimated Fair Value of Fixed Maturity Securities AFS	31,142	29,096
ABS & CLO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,973	17,910
Allowance for Credit Loss for Debt Securities	(9)	(7)	0	0
Gross Unrealized Gains	73	54
Gross Unrealized Losses	569	663
Estimated Fair Value of Fixed Maturity Securities AFS	17,468	17,294
Municipals
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,898	11,991
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	324	408
Gross Unrealized Losses	1,284	1,228
Estimated Fair Value of Fixed Maturity Securities AFS	10,938	11,171
CMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,315	10,855
Allowance for Credit Loss for Debt Securities	(20)	(18)	$ (11)	$ (19)
Gross Unrealized Gains	102	73
Gross Unrealized Losses	759	961
Estimated Fair Value of Fixed Maturity Securities AFS	$ 9,638	$ 9,949