Investments (Fixed Maturity Securities Available-For-Sale by Sector) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 310,884	$ 310,811
Allowance for Credit Loss for Debt Securities	(91)	(81)	$ 0
Gross Unrealized Gains	31,901	45,519
Gross Unrealized Losses	2,420	1,440
Estimated Fair Value of Fixed Maturity Securities AFS	340,274	354,809
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	82,694	79,788
Allowance for Credit Loss for Debt Securities	(30)	(44)	0
Gross Unrealized Gains	10,651	13,924
Gross Unrealized Losses	281	252
Estimated Fair Value of Fixed Maturity Securities AFS	93,034	93,416
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	59,124	60,995
Allowance for Credit Loss for Debt Securities	(28)	(16)	0
Gross Unrealized Gains	5,275	8,897
Gross Unrealized Losses	731	468
Estimated Fair Value of Fixed Maturity Securities AFS	63,640	69,408
Foreign government
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	56,848	63,243
Allowance for Credit Loss for Debt Securities	(19)	(21)	0
Gross Unrealized Gains	5,603	8,883
Gross Unrealized Losses	823	406
Estimated Fair Value of Fixed Maturity Securities AFS	61,609	71,699
U.S. government and agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	41,068	39,094
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	5,807	8,095
Gross Unrealized Losses	276	89
Estimated Fair Value of Fixed Maturity Securities AFS	46,599	47,100
RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29,152	28,415
Allowance for Credit Loss for Debt Securities	0	0	0
Gross Unrealized Gains	1,440	2,062
Gross Unrealized Losses	188	42
Estimated Fair Value of Fixed Maturity Securities AFS	30,404	30,435
ABS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18,443	16,963
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	185	231
Gross Unrealized Losses	59	75
Estimated Fair Value of Fixed Maturity Securities AFS	18,569	17,119
Municipals
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,761	10,982
Allowance for Credit Loss for Debt Securities	0	0
Gross Unrealized Gains	2,464	2,746
Gross Unrealized Losses	13	6
Estimated Fair Value of Fixed Maturity Securities AFS	14,212	13,722
CMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,794	11,331
Allowance for Credit Loss for Debt Securities	(14)	0	$ 0
Gross Unrealized Gains	476	681
Gross Unrealized Losses	49	102
Estimated Fair Value of Fixed Maturity Securities AFS	$ 12,207	$ 11,910

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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