DERIVATIVES - Schedule of Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Derivative	$ 11	$ 3	$ 17	$ 7
Hedge of interest rate risk | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative	32	(3)	84	6
Hedged Item	(31)	3	(83)	(6)
Hedge Ineffectiveness	$ 1	$ 0	$ 1	$ 0