OTHER OPERATING EXPENSE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other Income and Expenses [Abstract]
Deposit insurance	$ 16	$ 31
Promotional expense	27	25
Settlements and operating losses	11	12
Other	56	52
Other operating expense	$ 110	$ 120