RESTRUCTURING ACTIVITIES (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 39	$ 43
Employee Separation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	38	31
Other Restructuring Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Incurred cost			$ 29
Invigorate Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	39	44	76
Incurred cost	38	31	69
Invigorate Program [Member] | Cost of Services [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	32	21	27
Invigorate Program [Member] | Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 7	$ 23	49
Management Layer Reduction Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Incurred cost			20
Voluntary Retirement Program (Invigorate Program) [Member]
Restructuring Cost and Reserve [Line Items]
Incurred cost			4
Support Functions Outsourcing [Member]
Restructuring Cost and Reserve [Line Items]
Incurred cost			$ 16