FAIR VALUE MEASUREMENTS - Schedule of Changes in Level 3 (Details) - Recurring basis - Level 3 - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning of period balance	$ 1	$ 6	$ 5	$ 5
Purchases	0	0	1	0
Sales	0	0	0	0
Settlements	0	0	0	0
Net (losses) gains	(1)	0	(1)	1
Transfers from Level 3 to Level 2	0	0	(5)	0
Balance as of period end	0	6	0	6
Net unrealized gain included in net income for the year relating to assets held at period end	$ 0	$ 0	$ 0	$ 0