EXPENSES ASSOCIATED WITH LONG-DURATION INSURANCE PRODUCTS - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Long Duration Insurance Products [Line Items]
Percent of consolidated premiums and services revenues related to long-duration insurance products	1.00%	1.00%
Future policy benefits payable	$ 219,000,000	$ 2,923,000,000
Benefit expense with future policy benefits payable	0	(22,000,000)	$ 439,000,000
Long-term insurance reserve strengthening expense			505,000,000
Amortization of deferred acquisition costs	48,000,000	71,000,000	67,000,000
Deferred acquisition costs associated with our individual major medical policies		3,000,000
Adjustment to future policy benefits assuming unrealized gains on investments realized and reinvested at current yields		168,000,000
Increase in future policy benefits payable			659,000,000
Increase in reinsurance recoverable			154,000,000
Premium deficiency reserve	0	0	$ 0	$ 176,000,000
100% Coinsurance Agreements
Long Duration Insurance Products [Line Items]
Future policy benefits payable	$ 217,000,000	199,000,000
Percentage of coinsurance agreement	100.00%
Individual Major Medical Policies
Long Duration Insurance Products [Line Items]
Future policy benefits payable		19,000,000
Closed Block Long Term Care Policies
Long Duration Insurance Products [Line Items]
Future policy benefits payable		$ 2,300,000,000