INCOME TAXES - Principal Components of Net Deferred Tax Balances (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Future policy benefits payable	$ 231	$ 355
Benefits payable	113	196
Compensation and other accrued expenses	138	153
Net operating loss carryforward	53	52
Deferred acquisition costs	48	72
Unearned revenues	12	18
Investment securities	0	12
Other	1	6
Total deferred income tax assets	596	864
Valuation allowance	(49)	(49)
Total deferred income tax assets, net of valuation allowance	547	815
Depreciable property and intangible assets	(237)	(363)
Prepaid expenses	(44)	(53)
Investment securities	(49)	0
Total deferred income tax liabilities	(330)	(416)
Total net deferred income tax assets	$ 217	$ 399