LIABILITIES FOR FUTURE POLICYHOLDER BENEFITS - Policyholder Account Balance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Present Value of Expected Future Policy Benefits
Net liability for future policy benefits	$ 16,653	$ 16,573
Term
Present Value of Expected Net Premiums
Balance, beginning of period	2,125	2,090
Beginning balance at original discount rate	2,051	2,069
Effect of changes in cash flow assumptions		21	$ 47
Effect of actual variances from expected experience		(82)	(36)
Adjusted beginning of period balance		1,990	2,080
Issuances	53	64
Interest accrual	96	100
Net premiums collected	(186)	(194)
Ending Balance at original discount rate	1,953	2,051
Effect of changes in discount rate assumptions	(28)	74
Balance, end of period	1,925	2,125
Present Value of Expected Future Policy Benefits
Balance, beginning of period	3,466	3,449
Beginning balance of original discount rate	3,317	3,376
Effect of changes in cash flow assumptions		39	59
Effect of actual variances from expected experience		(102)	(43)
Adjusted beginning of period balance		3,254	3,392
Issuances	56	70
Interest accrual	162	166
Benefits payments	(269)	(311)
Ending balance at original discount rate	3,203	3,317
Effect of changes in discount rate assumptions	1	149
Balance, end of period	3,204	3,466
Net liability for future policy benefits	1,279	1,341
Less: Reinsurance recoverable	(217)	(210)
Net liability for future policy benefits, after reinsurance recoverable	$ 1,062	$ 1,131
Weighted-average duration of liability for future policyholder benefits (years)	6 years 8 months 12 days	7 years
Payout
Present Value of Expected Net Premiums
Balance, beginning of period	$ 0	$ 0
Beginning balance at original discount rate	0	0
Effect of changes in cash flow assumptions		0	0
Effect of actual variances from expected experience		0	0
Adjusted beginning of period balance		0	0
Issuances	0	0
Interest accrual	0	0
Net premiums collected	0	0
Ending Balance at original discount rate	0	0
Effect of changes in discount rate assumptions	0	0
Balance, end of period	0	0
Present Value of Expected Future Policy Benefits
Balance, beginning of period	4,464	3,517
Beginning balance of original discount rate	4,680	3,869
Effect of changes in cash flow assumptions		0	0
Effect of actual variances from expected experience		(2)	(4)
Adjusted beginning of period balance		4,678	3,865
Issuances	994	1,044
Interest accrual	174	127
Benefits payments	(456)	(356)
Ending balance at original discount rate	5,390	4,680
Effect of changes in discount rate assumptions	(340)	(216)
Balance, end of period	5,050	4,464
Net liability for future policy benefits	5,050	4,464
Less: Reinsurance recoverable	(2,151)	(1,337)
Net liability for future policy benefits, after reinsurance recoverable	$ 2,899	$ 3,127
Weighted-average duration of liability for future policyholder benefits (years)	7 years 8 months 12 days	8 years
Group Pension
Present Value of Expected Net Premiums
Balance, beginning of period	$ 0	$ 0
Beginning balance at original discount rate	0	0
Effect of changes in cash flow assumptions		0	0
Effect of actual variances from expected experience		0	0
Adjusted beginning of period balance		0	0
Issuances	0	0
Interest accrual	0	0
Net premiums collected	0	0
Ending Balance at original discount rate	0	0
Effect of changes in discount rate assumptions	0	0
Balance, end of period	0	0
Present Value of Expected Future Policy Benefits
Balance, beginning of period	490	523
Beginning balance of original discount rate	536	583
Effect of changes in cash flow assumptions		0	0
Effect of actual variances from expected experience		2	0
Adjusted beginning of period balance		538	583
Issuances	20	0
Interest accrual	18	19
Benefits payments	(62)	(66)
Ending balance at original discount rate	514	536
Effect of changes in discount rate assumptions	(54)	(46)
Balance, end of period	460	490
Net liability for future policy benefits	460	490
Less: Reinsurance recoverable	0	0
Net liability for future policy benefits, after reinsurance recoverable	$ 460	$ 490
Weighted-average duration of liability for future policyholder benefits (years)	6 years 10 months 24 days	7 years 1 month 6 days
Health
Present Value of Expected Net Premiums
Balance, beginning of period	$ (21)	$ (6)
Beginning balance at original discount rate	(22)	(6)
Effect of changes in cash flow assumptions		(3)	(6)
Effect of actual variances from expected experience		(5)	(12)
Adjusted beginning of period balance		(30)	(24)
Issuances	0	0
Interest accrual	(1)	(1)
Net premiums collected	5	3
Ending Balance at original discount rate	(26)	(22)
Effect of changes in discount rate assumptions	1	1
Balance, end of period	(25)	(21)
Present Value of Expected Future Policy Benefits
Balance, beginning of period	1,484	1,554
Beginning balance of original discount rate	1,672	1,795
Effect of changes in cash flow assumptions		0	(6)
Effect of actual variances from expected experience		(11)	(22)
Adjusted beginning of period balance		1,661	$ 1,767
Issuances	0	0
Interest accrual	54	57
Benefits payments	(160)	(152)
Ending balance at original discount rate	1,555	1,672
Effect of changes in discount rate assumptions	(218)	(188)
Balance, end of period	1,337	1,484
Net liability for future policy benefits	1,362	1,505
Less: Reinsurance recoverable	(1,070)	(1,191)
Net liability for future policy benefits, after reinsurance recoverable	$ 292	$ 314
Weighted-average duration of liability for future policyholder benefits (years)	8 years 4 months 24 days	8 years 8 months 12 days