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RESTRUCTURING CHARGES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]            
Liability recognized $ 22 $ 23 $ 75 $ 121 $ 211  
Employee Severance [Member]            
Restructuring Cost and Reserve [Line Items]            
Liability recognized     $ 35   $ 177  
Scenario, Forecast [Member] | Employee Severance [Member]            
Restructuring Cost and Reserve [Line Items]            
Charges associated with restructuring activities           $ 100