OTHER OPERATING EXPENSE (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Income and Expenses [Abstract]
Deposit insurance	$ 36	$ 29	$ 68	$ 55
Promotional expense	29	25	55	49
Settlements and operating losses	12	14	25	22
Other	71	60	126	117
Other operating expense	$ 148	$ 128	$ 274	$ 243