INVESTMENTS - Available-for-sale Securities (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 79,797		$ 79,797		$ 74,033
Allowance for Credit Losses	4		4		4
Gross Unrealized Gains	291		291		409
Gross Unrealized Losses	8,505		8,505		7,408
Fair Value	71,579		71,579		67,030
Amortized Cost (Less Allowance for Credit Losses)
Due in one year or less	2,187		2,187
Due in years two through five	15,150		15,150
Due in years six through ten	17,658		17,658
Due after ten years	24,490		24,490
Subtotal	59,485		59,485
Amortized Cost (Less Allowance for Credit Losses)	79,793		79,793
Fair Value
Due in one year or less	2,158		2,158
Due in years two through five	14,599		14,599
Due in years six through ten	16,426		16,426
Due after ten years	18,675		18,675
Subtotal	51,858		51,858
Fair Value	71,579		71,579		67,030
Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments
Proceeds from sales	1,331	$ 2,230	1,775	$ 3,055
Gross gains on sales	5	5	5	7
Gross losses on sales	(3)	(43)	(27)	(69)
Net (increase) decrease in Allowance for Credit and Intent to Sell losses	(3)	(7)	(5)	(63)
Fixed Maturities - Credit Loss Impairments
Balance, beginning of period	48	89	48	36
Previously recognized impairments on securities that matured, paid, prepaid or sold	(4)	(54)	(8)	(57)
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	3	6	6	9
Additional credit losses this period on securities previously impaired	3	3	4	4
Balance, end of period	50	$ 44	50	$ 44
Corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	52,490		52,490		49,786
Allowance for Credit Losses	4		4		4
Gross Unrealized Gains	209		209		320
Gross Unrealized Losses	6,265		6,265		5,360
Fair Value	46,430		46,430		44,742
Fair Value
Fair Value	46,430		46,430		44,742
U.S. government, agencies and authorities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,773		5,773		5,735
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	0		0		2
Gross Unrealized Losses	1,362		1,362		1,106
Fair Value	4,411		4,411		4,631
Fair Value
Fair Value	4,411		4,411		4,631
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	519		519		614
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	2		2		9
Gross Unrealized Losses	84		84		74
Fair Value	437		437		549
Fair Value
Fair Value	437		437		549
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	707		707		719
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	1		1		3
Gross Unrealized Losses	128		128		111
Fair Value	580		580		611
Fair Value
Fair Value	580		580		611
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,519		3,519		2,470
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	10		10		18
Gross Unrealized Losses	150		150		133
Fair Value	3,379		3,379		2,355
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	3,519		3,519
Fair Value
Without single maturity date	3,379		3,379
Fair Value	3,379		3,379		2,355
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,869		12,869		11,058
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	64		64		52
Gross Unrealized Losses	76		76		109
Fair Value	12,857		12,857		11,001
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	12,869		12,869
Fair Value
Without single maturity date	12,857		12,857
Fair Value	12,857		12,857		11,001
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,864		3,864		3,595
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	2		2		2
Gross Unrealized Losses	439		439		515
Fair Value	3,427		3,427		3,082
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	3,864		3,864
Fair Value
Without single maturity date	3,427		3,427
Fair Value	3,427		3,427		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	3		3		3
Gross Unrealized Losses	1		1		0
Fair Value	58		58		59
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	56		56
Fair Value
Without single maturity date	58		58
Fair Value	$ 58		$ 58		$ 59

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