OTHER OPERATING EXPENSE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
Deposit insurance	$ 104	$ 137	$ 120
Promotional expense	129	105	98
Settlements and operating losses	47	54	62
Other	215	246	241
Other operating expense	$ 495	$ 542	$ 521