OTHER OPERATING EXPENSE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Deposit insurance	$ 31	$ 32
Promotional expense	25	26
Settlements and operating losses	12	13
Other	52	53
Other operating expense	$ 120	$ 124