POLICY LIABILITIES - Changes in Liability for Unpaid Policy Claims (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Liability for Unpaid Claims and Claims Expenses
Unpaid supplemental health claims, beginning of year	$ 3,802	$ 3,630
Net balance, beginning of year	3,802
Less claims paid during the year on claims incurred during:
Net balance, end of year	4,045	3,802
Total liability for unpaid policy claims	4,045	3,802	$ 3,630
Health insurance
Liability for Unpaid Claims and Claims Expenses
Unpaid supplemental health claims, beginning of year	3,548	3,412	3,537
Less reinsurance recoverables	26	7	9
Net balance, beginning of year	3,522	3,405	3,528
Add claims incurred during the year related to:
Current year	7,037	6,416	6,866
Prior years	(465)	(353)	(301)
Total incurred	6,572	6,063	6,565
Less claims paid during the year on claims incurred during:
Current year	4,613	4,227	4,532
Prior years	1,865	1,718	1,873
Total paid	6,478	5,945	6,405
Effect of foreign exchange rate changes on unpaid claims	64	(1)	(283)
Net balance, end of year	3,680	3,522	3,405
Add reinsurance recoverables	27	26	7
Total liability for unpaid policy claims	3,707	3,548	3,412
Life insurance
Liability for Unpaid Claims and Claims Expenses
Unpaid supplemental health claims, beginning of year	254	218
Less claims paid during the year on claims incurred during:
Total liability for unpaid policy claims	$ 338	$ 254	$ 218