EXIT COSTS AND RESTRUCTURING RESERVES - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred	$ 0	$ 25,000,000	$ 0	$ 26,000,000
Outside Services
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred		5,000,000		6,000,000
Salaries & Employee Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred		5,000,000
Salaries & Employee Benefits | Salaries & Employee Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred				3,000,000
Occupancy & Equipment | Occupancy & Equipment
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred		$ 15,000,000		$ 17,000,000