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	$ 73,694		$ 73,429
Allowance for Credit Losses	21		22
Gross Unrealized Gains	1,578		5,125
Gross Unrealized Losses	2,865		316
Fair Value	72,386		78,216
Amortized Cost (Less Allowance for Credit Losses)
Due in one year or less	1,105
Due in years two through five	15,453
Due in years six through ten	18,663
Due after ten years	27,100
Subtotal	62,321
Amortized cost	73,673
Fair Value
Due in one year or less	1,102
Due in years two through five	15,348
Due in years six through ten	18,257
Due after ten years	26,602
Subtotal	61,309
Fair Value	72,386		78,216
Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments
Proceeds from sales	7,391	$ 7,209
Gross gains on sales	29	291
Gross losses on sales	(364)	(116)
Credit losses	1	(6)
Fixed Maturities - Credit Loss Impairments
Balance, beginning of period	44	32
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
Balance, end of period	43	$ 38
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	51,965		50,172
Allowance for Credit Losses	21		22
Gross Unrealized Gains	639		2,601
Gross Unrealized Losses	2,388		240
Fair Value	50,195		52,511
Fair Value
Fair Value	50,195		52,511
U.S. government, agencies and authorities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,586		13,056
Allowance for Credit Losses	0		0
Gross Unrealized Gains	853		2,344
Gross Unrealized Losses	91		15
Fair Value	9,348		15,385
Fair Value
Fair Value	9,348		15,385
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	670		586
Allowance for Credit Losses	0		0
Gross Unrealized Gains	43		78
Gross Unrealized Losses	31		2
Fair Value	682		662
Fair Value
Fair Value	682		662
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,121		1,124
Allowance for Credit Losses	0		0
Gross Unrealized Gains	17		42
Gross Unrealized Losses	54		14
Fair Value	1,084		1,152
Fair Value
Fair Value	1,084		1,152
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	84		90
Allowance for Credit Losses	0		0
Gross Unrealized Gains	4		8
Gross Unrealized Losses	0		0
Fair Value	88		98
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	84
Fair Value
Without single maturity date	88
Fair Value	88		98
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,528		5,933
Allowance for Credit Losses	0		0
Gross Unrealized Gains	9		21
Gross Unrealized Losses	113		20
Fair Value	7,424		5,934
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	7,528
Fair Value
Without single maturity date	7,424
Fair Value	7,424		5,934
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,700		2,427
Allowance for Credit Losses	0		0
Gross Unrealized Gains	5		19
Gross Unrealized Losses	188		25
Fair Value	3,517		2,421
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	3,700
Fair Value
Without single maturity date	3,517
Fair Value	3,517		2,421
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