RESTRUCTURING ACTIVITIES (Pre-Tax Restructuring charges) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 39	$ 43
Invigorate Program [Member]
Restructuring Cost and Reserve [Line Items]
Employee separation costs	38	31	$ 69
Facility-related costs	1	12	6
Asset impairment charges	0	1	0
Accelerated vesting of stock-based compensation	0	0	1
Total restructuring charges	39	44	76
Cost of Services [Member] | Invigorate Program [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	32	21	27
Selling, General and Administrative Expenses [Member] | Invigorate Program [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 7	$ 23	$ 49