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RESTRUCTURING ACTIVITIES (Narrative) (Details) - Invigorate Program [Member] - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]          
Employee separation costs $ 14 $ 14 $ 35 $ 28  
Facility-related costs and asset impairment charges 1 2 1 6  
Restructuring charges 15 16 36 35  
Cost of Services [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges 12 7 29 19  
Selling, General and Administrative Expenses [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges $ 3 $ 9 $ 7 $ 16  
Scenario, Forecast [Member] | Minimum [Member]          
Restructuring Cost and Reserve [Line Items]          
Employee separation costs         $ 35
Scenario, Forecast [Member] | Maximum [Member]          
Restructuring Cost and Reserve [Line Items]          
Employee separation costs         40
Facility-related costs and asset impairment charges         $ 5