Investments (Fixed Maturity Securities Available-For-Sale by Sector) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 309,406		$ 300,555
Allowance for Credit Loss for Debt Securities	(162)	$ (121)	(184)	$ (182)	$ (197)	$ (183)
Gross Unrealized Gains	8,093		6,876
Gross Unrealized Losses	23,558		25,835
Estimated Fair Value of Fixed Maturity Securities AFS	293,779		281,412
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	88,612		85,563
Allowance for Credit Loss for Debt Securities	(60)	(37)	(68)	(67)	(69)	(29)
Gross Unrealized Gains	2,275		1,894
Gross Unrealized Losses	5,976		6,672
Estimated Fair Value of Fixed Maturity Securities AFS	84,851		80,717
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	59,282		59,123
Allowance for Credit Loss for Debt Securities	(15)	(2)	(2)	(2)	(2)	(5)
Gross Unrealized Gains	2,164		1,750
Gross Unrealized Losses	4,679		5,427
Estimated Fair Value of Fixed Maturity Securities AFS	56,752		55,444
Foreign government
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	47,586		48,260
Allowance for Credit Loss for Debt Securities	(62)	(58)	(88)	(89)	(115)	(130)
Gross Unrealized Gains	1,776		1,754
Gross Unrealized Losses	5,168		4,437
Estimated Fair Value of Fixed Maturity Securities AFS	44,132		45,489
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	37,727		35,374
Allowance for Credit Loss for Debt Securities	0		0
Gross Unrealized Gains	589		590
Gross Unrealized Losses	3,640		3,712
Estimated Fair Value of Fixed Maturity Securities AFS	34,676		32,252
RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	36,761		31,479
Allowance for Credit Loss for Debt Securities	(1)	(1)	(1)	(1)	0	0
Gross Unrealized Gains	630		353
Gross Unrealized Losses	2,126		2,735
Estimated Fair Value of Fixed Maturity Securities AFS	35,264		29,096
ABS & CLO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,750		17,910
Allowance for Credit Loss for Debt Securities	(10)	(9)	(7)	(7)	0	0
Gross Unrealized Gains	138		54
Gross Unrealized Losses	358		663
Estimated Fair Value of Fixed Maturity Securities AFS	17,520		17,294
Municipals
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,521		11,991
Allowance for Credit Loss for Debt Securities	0		0
Gross Unrealized Gains	354		408
Gross Unrealized Losses	1,077		1,228
Estimated Fair Value of Fixed Maturity Securities AFS	10,798		11,171
CMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,167		10,855
Allowance for Credit Loss for Debt Securities	(14)	$ (14)	(18)	$ (16)	$ (11)	$ (19)
Gross Unrealized Gains	167		73
Gross Unrealized Losses	534		961
Estimated Fair Value of Fixed Maturity Securities AFS	$ 9,786		$ 9,949