POLICY LIABILITIES - Changes in Liability for Unpaid Policy Claims (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Liability for Unpaid Claims and Claims Expenses
Net balance, beginning of period			$ 4,836
Less claims paid during the period on claims incurred during:
Net balance, end of period	$ 4,453		4,453
Total liability for unpaid policy claims	4,453	$ 4,921	4,453	$ 4,921
Health insurance
Liability for Unpaid Claims and Claims Expenses
Unpaid supplemental health claims, beginning of period	4,009	4,192	4,067	4,389
Less reinsurance recoverables	40	37	37	39
Net balance, beginning of period	3,969	4,155	4,030	4,350
Add claims incurred during the period related to:
Current year	1,583	1,710	3,322	3,570
Prior years	(155)	(198)	(365)	(518)
Total incurred	1,428	1,512	2,957	3,052
Less claims paid during the period on claims incurred during:
Current year	1,042	1,139	1,532	1,657
Prior years	398	407	1,363	1,461
Total paid	1,440	1,546	2,895	3,118
Effect of foreign exchange rate changes on unpaid claims	(216)	4	(351)	(159)
Net balance, end of period	3,741	4,125	3,741	4,125
Add reinsurance recoverables	38	37	38	37
Total liability for unpaid policy claims	3,779	4,162	3,779	4,162
Life insurance
Less claims paid during the period on claims incurred during:
Total liability for unpaid policy claims	$ 674	$ 759	$ 674	$ 759