INSURANCE LIABILITIES AND ANNUITY BENEFITS - Changes in Future Policy Benefit Reserves (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Present value of expected future policy benefits
Future policy benefit reserves	$ 35,376		$ 37,689
Long-term care
Present value of expected net premiums
Balance, beginning of year	4,063	$ 4,059
Beginning balance at locked-in discount rate	3,745	3,958
Effect of changes in cash flow assumptions			16	$ 1
Effect of actual variances from expected experience			(26)	31
Adjusted beginning of year balance			3,735	3,991
Interest accrual	101	105
Net premiums collected	(196)	(201)
Effect of foreign currency	0	0
Ending balance at locked-in discount rate	3,640	3,895
Effect of changes in discount rate assumptions	164	239
Balance, end of year	3,803	4,134
Present value of expected future policy benefits
Balance, beginning of year	30,895	28,316
Beginning balance at locked-in discount rate	27,185	27,135	27,144	27,026
Effect of changes in cash flow assumptions			(10)	(14)
Effect of actual variances from expected experience			7	26
Adjusted beginning of year balance			27,141	27,038
Interest accrual	738	727
Benefit payments	(693)	(630)
Effect of foreign currency	0	0
Ending balance at locked-in discount rate	27,185	27,135
Effect of changes in discount rate assumptions	1,920	2,887
Balance, end of year	29,105	30,022
Future policy benefit reserves	25,301	25,888	26,832
Less: Reinsurance recoverables, net of allowance for credit losses	(155)	(186)
Net future policy benefit reserves, after reinsurance recoverables	25,146	25,702
Structured settlement annuities
Present value of expected net premiums
Balance, beginning of year	0	0
Beginning balance at locked-in 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 year balance			0	0
Interest accrual	0	0
Net premiums collected	0	0
Effect of foreign currency	0	0
Ending balance at locked-in discount rate	0	0
Effect of changes in discount rate assumptions	0	0
Balance, end of year	0	0
Present value of expected future policy benefits
Balance, beginning of year	9,357	8,860
Beginning balance at locked-in discount rate	8,429	8,691	8,561	8,790
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			(25)	10
Adjusted beginning of year balance			8,536	8,800
Interest accrual	222	229
Benefit payments	(328)	(338)
Effect of foreign currency	0	0
Ending balance at locked-in discount rate	8,429	8,691
Effect of changes in discount rate assumptions	271	533
Balance, end of year	8,700	9,224
Future policy benefit reserves	8,700	9,224	9,357
Less: Reinsurance recoverables, net of allowance for credit losses	0	0
Net future policy benefit reserves, after reinsurance recoverables	8,700	9,224
Life
Present value of expected net premiums
Balance, beginning of year	4,803	4,828
Beginning balance at locked-in discount rate	4,773	5,210
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			(34)	(87)
Adjusted beginning of year balance			4,739	5,122
Interest accrual	90	100
Net premiums collected	(140)	(150)
Effect of foreign currency	(91)	86
Ending balance at locked-in discount rate	4,597	5,159
Effect of changes in discount rate assumptions	(183)	(162)
Balance, end of year	4,415	4,997
Present value of expected future policy benefits
Balance, beginning of year	5,921	5,868
Beginning balance at locked-in discount rate	5,591	6,126	5,847	6,247
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			(51)	(44)
Adjusted beginning of year balance			5,796	$ 6,203
Interest accrual	110	119
Benefit payments	(219)	(287)
Effect of foreign currency	(96)	91
Ending balance at locked-in discount rate	5,591	6,126
Effect of changes in discount rate assumptions	(166)	(144)
Balance, end of year	5,424	5,983
Future policy benefit reserves	1,010	985	$ 1,117
Less: Reinsurance recoverables, net of allowance for credit losses	(31)	(34)
Net future policy benefit reserves, after reinsurance recoverables	$ 979	$ 952