GUARANTEES AND CONTINGENCIES (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Nov. 02, 2017
Loss Contingencies [Line Items]
Litigation recoveries sought		$ 611
Total Medicare
Loss Contingencies [Line Items]
Percentage of premiums and services revenue	81.00%
Military services
Loss Contingencies [Line Items]
Percentage of premiums and services revenue	1.00%
Medicaid
Loss Contingencies [Line Items]
Percentage of premiums and services revenue	4.00%