OTHER OPERATING EXPENSE (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Income and Expenses [Abstract]
Deposit insurance	$ 16	$ 28	$ 32	$ 59
Promotional expense	28	34	55	59
Settlements and operating losses	9	12	20	24
Other	65	53	121	105
Other operating expense	$ 118	$ 127	$ 228	$ 247