EXIT COSTS AND RESTRUCTURING RESERVES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred	$ 0	$ 0	$ 0	$ 27
Outside Services
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred				6
Occupancy & Equipment | Occupancy & Equipment
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred				18
Salaries & Employee Benefits | Salaries & Employee Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred				$ 3