Investments (Fixed Maturity Securities Available-For-Sale by Sector) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 313,872	$ 310,884
Allowance for Credit Loss for Debt Securities	(355)	(91)	$ (104)	$ (81)
Gross Unrealized Gains	16,145	31,901
Gross Unrealized Losses	9,583	2,420
Estimated Fair Value of Fixed Maturity Securities AFS	320,079	340,274
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	84,609	82,694
Allowance for Credit Loss for Debt Securities	(13)	(30)	(43)	(44)
Gross Unrealized Gains	4,622	10,651
Gross Unrealized Losses	2,082	281
Estimated Fair Value of Fixed Maturity Securities AFS	87,136	93,034
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	61,061	59,124
Allowance for Credit Loss for Debt Securities	(102)	(28)	(33)	(16)
Gross Unrealized Gains	2,345	5,275
Gross Unrealized Losses	2,175	731
Estimated Fair Value of Fixed Maturity Securities AFS	61,129	63,640
Foreign government
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	55,741	56,848
Allowance for Credit Loss for Debt Securities	(226)	(19)	(21)	(21)
Gross Unrealized Gains	3,754	5,603
Gross Unrealized Losses	1,987	823
Estimated Fair Value of Fixed Maturity Securities AFS	57,282	61,609
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	38,166	41,068
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	3,312	5,807
Gross Unrealized Losses	1,144	276
Estimated Fair Value of Fixed Maturity Securities AFS	40,334	46,599
RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	30,541	29,152
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	663	1,440
Gross Unrealized Losses	1,124	188
Estimated Fair Value of Fixed Maturity Securities AFS	30,080	30,404
ABS & CLO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	19,640	18,443
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	59	185
Gross Unrealized Losses	394	59
Estimated Fair Value of Fixed Maturity Securities AFS	19,305	18,569
Municipals
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,109	11,761
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	1,247	2,464
Gross Unrealized Losses	398	13
Estimated Fair Value of Fixed Maturity Securities AFS	12,958	14,212
CMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,005	11,794
Allowance for Credit Loss for Debt Securities	(14)	(14)	$ (7)	$ 0
Gross Unrealized Gains	143	476
Gross Unrealized Losses	279	49
Estimated Fair Value of Fixed Maturity Securities AFS	$ 11,855	$ 12,207

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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