POLICY LIABILITIES - Changes in Liability for Unpaid Policy Claims (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 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	$ 4,516		4,516
Total liability for unpaid policy claims	4,516	$ 4,909	4,516	$ 4,909
Health insurance
Liability for Unpaid Claims and Claims Expenses
Unpaid supplemental health claims, beginning of period	3,779	4,162	4,067	4,389
Less reinsurance recoverables	38	37	37	39
Net balance, beginning of period	3,741	4,125	4,030	4,350
Add claims incurred during the period related to:
Current year	1,689	1,720	5,007	5,302
Prior years	(151)	(215)	(512)	(739)
Total incurred	1,538	1,505	4,495	4,563
Less claims paid during the period on claims incurred during:
Current year	1,148	1,279	2,703	2,947
Prior years	214	219	1,554	1,676
Total paid	1,362	1,498	4,257	4,623
Effect of foreign exchange rate changes on unpaid claims	(105)	(29)	(456)	(187)
Net balance, end of period	3,812	4,103	3,812	4,103
Add reinsurance recoverables	50	39	50	39
Total liability for unpaid policy claims	3,862	4,142	3,862	4,142
Life insurance
Less claims paid during the period on claims incurred during:
Total liability for unpaid policy claims	$ 654	$ 767	$ 654	$ 767