GOODWILL AND OTHER INTANGIBLES (Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		1 Months Ended	6 Months Ended				6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 SCUSA [Member]	Jan. 31, 2014 Retail Banking [Member] branch	Jun. 30, 2014 Retail Banking [Member]	Jun. 30, 2014 Investment Services [Member]	Jun. 30, 2014 Auto Finance & Alliances [Member]	Dec. 31, 2013 Auto Finance & Alliances [Member]	Jun. 30, 2014 Real Estate and Commercial Banking [Member]	Jun. 30, 2014 Specialty & Government Banking [Member]	Jun. 30, 2014 Global Banking & Markets and Large Corporate [Member]	Dec. 31, 2013 Global Banking & Markets and Large Corporate [Member]
Goodwill [Line Items]
Number of branches sold			3
Goodwill [Roll Forward]
Goodwill, Beginning balance	$ 3,431,481	$ 0	$ 1,696,086	$ 1,696,086	$ 126,695	$ 71,522	$ 71,522	$ 1,163,154	$ 242,894	$ 131,130	$ 131,130
Disposals during the period	(7,052)			(7,052)
Additions during the period	5,476,844	5,476,844
Re-allocations during the period	0			126,695	(126,695)			242,894	(242,894)
Goodwill, Ending balance	$ 8,901,273	$ 5,476,844		$ 1,815,729	$ 0	$ 71,522	$ 71,522	$ 1,406,048	$ 0	$ 131,130	$ 131,130