RESTRUCTURING CHARGES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 23	$ 113	$ 121	$ 127	$ 129
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 95		$ 112
Scenario, Forecast [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Charges associated with restructuring activities						$ 180	$ 145