OTHER OPERATING EXPENSE (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Income and Expenses [Abstract]
Deposit insurance	$ 14	$ 29	$ 46	$ 88
Promotional expense	31	36	86	95
Settlements and operating losses	10	11	30	35
Other	72	55	193	160
Other operating expense	$ 127	$ 131	$ 355	$ 378