INVESTMENTS - Available-for-sale Securities (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 68,876		$ 68,636
Allowance for Credit Losses	21		22
Gross Unrealized Gains	1,400		4,752
Gross Unrealized Losses	2,677		290
Fair Value	67,578		73,076
Amortized Cost (Less Allowance for Credit Losses)
Due in one year or less	854
Due in years two through five	13,714
Due in years six through ten	16,998
Due after ten years	26,056
Subtotal	57,622
Amortized cost	68,855
Fair Value
Due in one year or less	852
Due in years two through five	13,631
Due in years six through ten	16,629
Due after ten years	25,499
Subtotal	56,611
Fair Value	67,578		73,076
Available For Sale Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments [Abstract]
Proceeds from sales	7,336	$ 7,188
Gross gains on sales	29	291
Gross losses on sales	(361)	(116)
Credit losses	1	(6)
Fixed Maturities - Credit Loss Impairments
Balances, beginning of period	42	28
Previously recognized impairments on securities that matured, paid, prepaid or sold	(2)	0
Recognized impairments on securities impaired to fair value this period	0	0
Credit losses recognized this period on securities for which credit losses were not previously recognized	0	2
Additional credit losses this period on securities previously impaired	1	4
Increases due to passage of time on previously recorded credit losses	0	0
Accretion of previously recognized impairments due to increases in expected cash flows (for OTTI securities 2019 and prior)	0	0
Balances, end of period	41	$ 34
Corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	47,337		45,578
Allowance for Credit Losses	21		22
Gross Unrealized Gains	602		2,382
Gross Unrealized Losses	2,215		214
Fair Value	45,703		47,724
Fair Value
Fair Value	45,703		47,724
U.S. government, agencies and authorities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,577		13,032
Allowance for Credit Losses	0		0
Gross Unrealized Gains	712		2,196
Gross Unrealized Losses	87		14
Fair Value	9,202		15,214
Fair Value
Fair Value	9,202		15,214
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	609		527
Allowance for Credit Losses	0		0
Gross Unrealized Gains	43		73
Gross Unrealized Losses	29		3
Fair Value	623		597
Fair Value
Fair Value	623		597
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,120		1,124
Allowance for Credit Losses	0		0
Gross Unrealized Gains	17		42
Gross Unrealized Losses	54		14
Fair Value	1,083		1,152
Fair Value
Fair Value	1,083		1,152
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	77		82
Allowance for Credit Losses	0		0
Gross Unrealized Gains	4		8
Gross Unrealized Losses	0		0
Fair Value	81		90
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	77
Fair Value
Without single maturity date	81
Fair Value	81		90
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,497		5,904
Allowance for Credit Losses	0		0
Gross Unrealized Gains	9		20
Gross Unrealized Losses	111		19
Fair Value	7,395		5,905
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	7,497
Fair Value
Without single maturity date	7,395
Fair Value	7,395		5,905
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,619		2,348
Allowance for Credit Losses	0		0
Gross Unrealized Gains	5		19
Gross Unrealized Losses	181		26
Fair Value	3,443		2,341
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	3,619
Fair Value
Without single maturity date	3,443
Fair Value	3,443		2,341
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	40		41
Allowance for Credit Losses	0		0
Gross Unrealized Gains	8		12
Gross Unrealized Losses	0		0
Fair Value	48		53
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	40
Fair Value
Without single maturity date	48
Fair Value	$ 48		$ 53

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Amount of other-than-temporary impairment (OTTI) on investment in debt security, recognized in earnings.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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