OTHER OPERATING EXPENSE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Promotional expense	$ 112	$ 129	$ 105
Deposit insurance	62	104	137
Other	302	262	300
Other operating expense	$ 476	$ 495	$ 542