INCOME TAXES - Income Tax Effects of Temporary Differences that Gave Rise to Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax liabilities:
Deferred policy acquisition costs	$ 2,282	$ 2,209
Unrealized gains on investment securities	1,684	2,584
Premiums receivable	139	139
Policy benefit reserves	1,313	1,376
Depreciation	61	51
Other	0	20
Total deferred income tax liabilities	5,479	6,379
Deferred income tax assets:
Other basis differences in investment securities	1,422	1,331
Unfunded retirement benefits	15	16
Other accrued expenses	7	4
Policy and contract claims	113	99
Foreign currency loss on Japan branch	208	327
Deferred compensation	181	226
Capital loss carryforwards	0	26
Other	95	0
Total deferred income tax assets	2,041	2,029
Net deferred income tax liability	3,438	4,350
Current income tax liability	902	943
Total income tax liability	$ 4,340	$ 5,293