Investments (Fixed Maturity Securities Available-For-Sale by Sector) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 303,191		$ 300,555
Allowance for Credit Loss for Debt Securities	(121)	$ (113)	(184)	$ (197)	$ (193)	$ (183)
Gross Unrealized Gains	5,096		6,876
Gross Unrealized Losses	30,430		25,835
Estimated Fair Value of Fixed Maturity Securities AFS	277,736		281,412
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	87,346		85,563
Allowance for Credit Loss for Debt Securities	(37)	(15)	(68)	(69)	(63)	(29)
Gross Unrealized Gains	1,573		1,894
Gross Unrealized Losses	8,204		6,672
Estimated Fair Value of Fixed Maturity Securities AFS	80,678		80,717
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	58,031		59,123
Allowance for Credit Loss for Debt Securities	(2)	(2)	(2)	(2)	(2)	(5)
Gross Unrealized Gains	1,513		1,750
Gross Unrealized Losses	6,123		5,427
Estimated Fair Value of Fixed Maturity Securities AFS	53,419		55,444
Foreign government
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	44,444		48,260
Allowance for Credit Loss for Debt Securities	(58)	(66)	(88)	(115)	(117)	(130)
Gross Unrealized Gains	1,071		1,754
Gross Unrealized Losses	5,403		4,437
Estimated Fair Value of Fixed Maturity Securities AFS	40,054		45,489
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	37,991		35,374
Allowance for Credit Loss for Debt Securities	0		0
Gross Unrealized Gains	238		590
Gross Unrealized Losses	4,991		3,712
Estimated Fair Value of Fixed Maturity Securities AFS	33,238		32,252
RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	35,366		31,479
Allowance for Credit Loss for Debt Securities	(1)	(1)	(1)	0	0	0
Gross Unrealized Gains	305		353
Gross Unrealized Losses	3,054		2,735
Estimated Fair Value of Fixed Maturity Securities AFS	32,616		29,096
ABS & CLO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18,207		17,910
Allowance for Credit Loss for Debt Securities	(9)	(9)	(7)	0	0	0
Gross Unrealized Gains	89		54
Gross Unrealized Losses	512		663
Estimated Fair Value of Fixed Maturity Securities AFS	17,775		17,294
Municipals
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,642		11,991
Allowance for Credit Loss for Debt Securities	0		0
Gross Unrealized Gains	229		408
Gross Unrealized Losses	1,401		1,228
Estimated Fair Value of Fixed Maturity Securities AFS	10,470		11,171
CMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,164		10,855
Allowance for Credit Loss for Debt Securities	(14)	$ (20)	(18)	$ (11)	$ (11)	$ (19)
Gross Unrealized Gains	78		73
Gross Unrealized Losses	742		961
Estimated Fair Value of Fixed Maturity Securities AFS	$ 9,486		$ 9,949