INVESTMENTS - Available-for-sale Securities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 63,853		$ 63,853		$ 68,087
Allowance for Credit Losses	2		2		24
Gross Unrealized Gains	76		76		105
Gross Unrealized Losses	10,147		10,147		9,221
Fair Value	53,780		53,780		58,947
Amortized Cost (Less Allowance for Credit Losses)
Due in one year or less	1,204		1,204
Due in years two through five	12,493		12,493
Due in years six through ten	13,842		13,842
Due after ten years	22,857		22,857
Subtotal	50,396		50,396
Amortized Cost (Less Allowance for Credit Losses)	63,851		63,851
Fair Value
Due in one year or less	1,193		1,193
Due in years two through five	11,722		11,722
Due in years six through ten	12,089		12,089
Due after ten years	16,278		16,278
Subtotal	41,282		41,282
Fair Value	53,780		53,780		58,947
Available For Sale Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments [Abstract]
Proceeds from sales	2,352	$ 878	5,313	$ 11,512
Gross gains on sales	1	0	8	38
Gross losses on sales	(445)	(73)	(509)	(663)
Net (increase) decrease in Allowance for Credit and Intent to Sell losses	0	(248)	(62)	(251)
Gross gains on sales	0	0	0	0
Gross losses on sales	(101)	0	(135)	0
Fixed Maturities - Credit Loss Impairments
Balances, beginning of period	44	32	36	42
Previously recognized impairments on securities that matured, paid, prepaid or sold	(1)	(2)	(56)	(15)
Recognized impairments on securities impaired to fair value this period	0	251	50	251
Credit losses recognized this period on securities for which credit losses were not previously recognized	1	(1)	10	0
Additional credit losses this period on securities previously impaired	0	5	4	7
Balances, end of period	44	$ 285	44	$ 285
Corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	43,440		43,440		46,053
Allowance for Credit Losses	2		2		24
Gross Unrealized Gains	57		57		89
Gross Unrealized Losses	7,365		7,365		6,655
Fair Value	36,130		36,130		39,463
Fair Value
Fair Value	36,130		36,130		39,463
U.S. Treasury, government and agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,642		5,642		7,049
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	0		0		1
Gross Unrealized Losses	1,564		1,564		1,312
Fair Value	4,078		4,078		5,738
Fair Value
Fair Value	4,078		4,078		5,738
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	525		525		540
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	2		2		7
Gross Unrealized Losses	85		85		76
Fair Value	442		442		471
Fair Value
Fair Value	442		442		471
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	791		791		985
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	1		1		2
Gross Unrealized Losses	160		160		151
Fair Value	632		632		836
Fair Value
Fair Value	632		632		836
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	982		982		860
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	0		0		1
Gross Unrealized Losses	115		115		84
Fair Value	867		867		777
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	982		982
Fair Value
Without single maturity date	867		867
Fair Value	867		867		777
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,685		8,685		8,817
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	13		13		3
Gross Unrealized Losses	200		200		371
Fair Value	8,498		8,498		8,449
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	8,685		8,685
Fair Value
Without single maturity date	8,498		8,498
Fair Value	8,498		8,498		8,449
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,747		3,747		3,742
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	1		1		0
Gross Unrealized Losses	658		658		572
Fair Value	3,090		3,090		3,170
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	3,747		3,747
Fair Value
Without single maturity date	3,090		3,090
Fair Value	3,090		3,090		3,170
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	41		41		41
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	2		2		2
Gross Unrealized Losses	0		0		0
Fair Value	43		43		43
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	41		41
Fair Value
Without single maturity date	43		43
Fair Value	$ 43		$ 43		$ 43