INVESTMENTS - Available-for-sale Securities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 80,753		$ 80,753		$ 84,717
Allowance for Credit Losses	0		0		2
Gross Unrealized Gains	914		914		373
Gross Unrealized Losses	5,816		5,816		8,447
Fair Value	75,851		75,851		76,641
Amortized Cost (Less Allowance for Credit Losses)
Due in one year or less	2,374		2,374
Due in years two through five	14,643		14,643
Due in years six through ten	17,039		17,039
Due after ten years	19,554		19,554
Subtotal	53,610		53,610
Amortized Cost (Less Allowance for Credit Losses)	80,753		80,753
Fair Value
Due in one year or less	2,361		2,361
Due in years two through five	14,508		14,508
Due in years six through ten	16,862		16,862
Due after ten years	15,142		15,142
Subtotal	48,873		48,873
Fair Value	75,851		75,851		76,641
Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments
Proceeds from sales	1,953	$ 461	6,216	$ 2,236
Gross gains on sales	10	2	19	7
Gross losses on sales	(17)	(27)	(50)	(54)
Net (increase) decrease in Allowance for Credit and Intent to Sell losses	(7)	(2)	(26)	(7)
Fixed Maturities - Credit Loss Impairments
Balance, beginning of period	61	50	47	48
Previously recognized impairments on securities that matured, paid, prepaid or sold	(18)	3	(23)	(5)
Recognized impairments on securities impaired to fair value this period	22	0	22	0
Credit losses recognized this period on securities for which credit losses were not previously recognized	(12)	(1)	5	5
Additional credit losses this period on securities previously impaired	0	(2)	2	2
Balance, end of period	53	$ 50	53	$ 50
Corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	47,594		47,594		55,163
Allowance for Credit Losses	0		0		2
Gross Unrealized Gains	664		664		249
Gross Unrealized Losses	3,994		3,994		6,112
Fair Value	44,264		44,264		49,298
Fair Value
Fair Value	44,264		44,264		49,298
U.S. government, agencies and authorities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,042		5,042		5,801
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	2		2		0
Gross Unrealized Losses	1,264		1,264		1,513
Fair Value	3,780		3,780		4,288
Fair Value
Fair Value	3,780		3,780		4,288
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	379		379		472
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	2		2		2
Gross Unrealized Losses	70		70		88
Fair Value	311		311		386
Fair Value
Fair Value	311		311		386
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	595		595		689
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	3		3		1
Gross Unrealized Losses	80		80		136
Fair Value	518		518		554
Fair Value
Fair Value	518		518		554
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,589		6,589		4,520
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	75		75		15
Gross Unrealized Losses	98		98		152
Fair Value	6,566		6,566		4,383
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	6,589		6,589
Fair Value
Without single maturity date	6,566		6,566
Fair Value	6,566		6,566		4,383
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,675		15,675		13,715
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	138		138		98
Gross Unrealized Losses	41		41		61
Fair Value	15,772		15,772		13,752
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	15,675		15,675
Fair Value
Without single maturity date	15,772		15,772
Fair Value	15,772		15,772		13,752
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,825		4,825		4,301
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	26		26		5
Gross Unrealized Losses	269		269		385
Fair Value	4,582		4,582		3,921
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	4,825		4,825
Fair Value
Without single maturity date	4,582		4,582
Fair Value	4,582		4,582		3,921
Redeemable preferred stock
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	54		54		56
Allowance for Credit Losses	0		0		0
Gross Unrealized Gains	4		4		3
Gross Unrealized Losses	0		0		0
Fair Value	58		58		59
Amortized Cost (Less Allowance for Credit Losses)
Without single maturity date	54		54
Fair Value
Without single maturity date	58		58
Fair Value	$ 58		$ 58		$ 59

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