PREMISES, EQUIPMENT, AND SOFTWARE - Schedule of Amortization (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Capitalized Software, Expected Future Amortization Expense [Abstract]
2015	$ 127
2016	110
2017	93
2018	72
2019	41
Thereafter	130
Total	573	[1]
In-process software	$ 181

[1] Excluded from this balance is $181 million of in-process software at December 31, 2014.