OTHER OPERATING EXPENSE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Income and Expenses [Abstract]
Deposit insurance	$ 115	$ 95	$ 85
Promotional expense	101	86	76
Settlements and operating losses	43	89	51
Postage and delivery	46	48	60
Other	225	255	256
Other operating expense	$ 530	$ 573	$ 528