REINSURANCE AGREEMENTS - Liability for unpaid claims (Details) - Individual Disability Income And Major Medical - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Claim reserves and associated liabilities net of reinsurance ceded for individual DI and major medical policies	$ 80	$ 78
DI reserves and associated liabilities ceded	1,652	1,714
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Incurred benefits related to current year	11	14	$ 15
Incurred benefits related to prior years	22	16	10
Total Incurred Benefits	33	30	25
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Benefits paid related to current year	18	20	19
Benefits paid related to prior years	13	11	13
Total Benefits Paid	$ 31	$ 31	$ 32