POLICY LIABILITIES - Changes in Liability for Unpaid Policy Claims (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Liability for Unpaid Claims and Claims Expenses
Unpaid supplemental health claims, beginning of year	$ 3,630	$ 3,763
Net balance, beginning of year	3,630
Less claims paid during the year on claims incurred during:
Net balance, end of year	3,802	3,630
Total liability for unpaid policy claims	3,802	3,630	$ 3,763
Health insurance
Liability for Unpaid Claims and Claims Expenses
Unpaid supplemental health claims, beginning of year	3,412	3,537	3,781
Less reinsurance recoverables	7	9	10
Net balance, beginning of year	3,405	3,528	3,771
Add claims incurred during the year related to:
Current year	6,416	6,866	7,215
Prior years	(353)	(301)	(236)
Total incurred	6,063	6,565	6,979
Less claims paid during the year on claims incurred during:
Current year	4,227	4,532	4,834
Prior years	1,718	1,873	1,931
Total paid	5,945	6,405	6,765
Effect of foreign exchange rate changes on unpaid claims	(1)	(283)	(457)
Net balance, end of year	3,522	3,405	3,528
Add reinsurance recoverables	26	7	9
Total liability for unpaid policy claims	3,548	3,412	3,537
Life insurance
Liability for Unpaid Claims and Claims Expenses
Unpaid supplemental health claims, beginning of year	218	226
Less claims paid during the year on claims incurred during:
Total liability for unpaid policy claims	$ 254	$ 218	$ 226