DERIVATIVES - Schedule of Fair Value Hedges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Derivative	$ 65	$ 32	$ 33
Hedge of interest rate risk | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative	(6)	(2)	(4)
Hedged Item	5	2	4
Hedge Ineffectiveness	$ (1)	$ 0	$ 0