INVESTMENTS - Available-for-sale Securities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 81,681		$ 81,681		$ 74,033
Allowance for Credit Losses	4		4		4
Gross Unrealized Gains	928		928		409
Gross Unrealized Losses	6,360		6,360		7,408
Fair Value	76,245		76,245		67,030
Amortized Cost (Less Allowance for Credit Losses)
Due in one year or less	2,458		2,458
Due in years two through five	14,437		14,437
Due in years six through ten	18,983		18,983
Due after ten years	24,541		24,541
Subtotal	60,419		60,419
Amortized Cost (Less Allowance for Credit Losses)	81,677		81,677
Fair Value
Due in one year or less	2,436		2,436
Due in years two through five	14,260		14,260
Due in years six through ten	18,566		18,566
Due after ten years	19,993		19,993
Subtotal	55,255		55,255
Fair Value	76,245		76,245		67,030
Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments
Proceeds from sales	461	$ 2,524	2,236	$ 5,579
Gross gains on sales	2	1	7	8
Gross losses on sales	(27)	(348)	(54)	(417)
Net (increase) decrease in Allowance for Credit and Intent to Sell losses	(2)	(1)	(7)	(64)
Fixed Maturities - Credit Loss Impairments
Balance, beginning of period	50	44	48	36
Previously recognized impairments on securities that matured, paid, prepaid or sold	3	(1)	(5)	(58)
Recognized impairments on securities impaired to fair value this period	0	0	0	52
Credit losses recognized this period on securities for which credit losses were not previously recognized	(1)	1	5	10
Additional credit losses this period on securities previously impaired	(2)	0	2	4
Balance, end of period	50	$ 44	50	$ 44
Corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	53,453		53,453		49,786
Allowance for Credit Losses	4		4		4
Gross Unrealized Gains	705		705		320
Gross Unrealized Losses	4,630		4,630		5,360
Fair Value	49,524		49,524		44,742
Fair Value
Fair Value	49,524		49,524		44,742
U.S. government, agencies and authorities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,795		5,795		5,735
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	3		3		2
Gross Unrealized Losses	1,082		1,082		1,106
Fair Value	4,716		4,716		4,631
Fair Value
Fair Value	4,716		4,716		4,631
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	472		472		614
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	5		5		9
Gross Unrealized Losses	69		69		74
Fair Value	408		408		549
Fair Value
Fair Value	408		408		549
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	703		703		719
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	4		4		3
Gross Unrealized Losses	100		100		111
Fair Value	607		607		611
Fair Value
Fair Value	607		607		611
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,934		3,934		2,470
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	51		51		18
Gross Unrealized Losses	97		97		133
Fair Value	3,888		3,888		2,355
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	3,934		3,934
Fair Value
Without single maturity date	3,888		3,888
Fair Value	3,888		3,888		2,355
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,290		13,290		11,058
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	142		142		52
Gross Unrealized Losses	45		45		109
Fair Value	13,387		13,387		11,001
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	13,290		13,290
Fair Value
Without single maturity date	13,387		13,387
Fair Value	13,387		13,387		11,001
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,978		3,978		3,595
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	14		14		2
Gross Unrealized Losses	337		337		515
Fair Value	3,655		3,655		3,082
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	3,978		3,978
Fair Value
Without single maturity date	3,655		3,655
Fair Value	3,655		3,655		3,082
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	56		56		56
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	4		4		3
Gross Unrealized Losses	0		0		0
Fair Value	60		60		59
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	56		56
Fair Value
Without single maturity date	60		60
Fair Value	$ 60		$ 60		$ 59

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