Investments (Fixed Maturity Securities Available-For-Sale by Sector) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 306,181		$ 306,025
Allowance for Credit Loss for Debt Securities	(182)	$ (197)	(183)	$ (198)	$ (261)	$ (91)
Gross Unrealized Gains	3,685		5,239
Gross Unrealized Losses	38,702		34,301
Estimated Fair Value of Fixed Maturity Securities AFS	270,982		276,780
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	88,733		88,466
Allowance for Credit Loss for Debt Securities	(67)	(69)	(29)	(30)	(28)	(30)
Gross Unrealized Gains	877		1,133
Gross Unrealized Losses	10,991		9,540
Estimated Fair Value of Fixed Maturity Securities AFS	78,552		80,030
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	58,674		59,696
Allowance for Credit Loss for Debt Securities	(2)	(2)	(5)	(13)	(53)	(28)
Gross Unrealized Gains	1,026		1,213
Gross Unrealized Losses	8,321		8,332
Estimated Fair Value of Fixed Maturity Securities AFS	51,377		52,572
Foreign government
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	46,754		50,047
Allowance for Credit Loss for Debt Securities	(89)	(115)	(130)	(136)	(166)	(19)
Gross Unrealized Gains	1,251		1,876
Gross Unrealized Losses	5,231		5,046
Estimated Fair Value of Fixed Maturity Securities AFS	42,685		46,747
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	37,678		35,658
Allowance for Credit Loss for Debt Securities	0		0
Gross Unrealized Gains	146		431
Gross Unrealized Losses	6,095		3,860
Estimated Fair Value of Fixed Maturity Securities AFS	31,729		32,229
RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	31,675		29,496
Allowance for Credit Loss for Debt Securities	(1)	0	0	0	0	0
Gross Unrealized Gains	156		187
Gross Unrealized Losses	4,045		3,518
Estimated Fair Value of Fixed Maturity Securities AFS	27,785		26,165
ABS & CLO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18,286		17,991
Allowance for Credit Loss for Debt Securities	(7)	0	0	0	0	0
Gross Unrealized Gains	32		23
Gross Unrealized Losses	899		1,192
Estimated Fair Value of Fixed Maturity Securities AFS	17,412		16,822
Municipals
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,057		13,548
Allowance for Credit Loss for Debt Securities	0		0
Gross Unrealized Gains	164		317
Gross Unrealized Losses	1,874		1,713
Estimated Fair Value of Fixed Maturity Securities AFS	11,347		12,152
CMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,324		11,123
Allowance for Credit Loss for Debt Securities	(16)	$ (11)	(19)	$ (19)	$ (14)	$ (14)
Gross Unrealized Gains	33		59
Gross Unrealized Losses	1,246		1,100
Estimated Fair Value of Fixed Maturity Securities AFS	$ 10,095		$ 10,063