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BUSINESS SEGMENTS - Narrative (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of segments		2us-gaap_NumberOfReportableSegments
Revenues		$ 4,979us-gaap_Revenues	$ 4,690us-gaap_Revenues	$ 4,894us-gaap_Revenues
Goodwill impairment		0us-gaap_GoodwillImpairmentLoss	(4,435)us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Consumer Banking
Segment Reporting Information [Line Items]
Revenues		3,050	3,201	3,384
Goodwill impairment	(4,400)		(4,435)
Commercial Banking
Segment Reporting Information [Line Items]
Revenues		1,502	1,420	1,385
Goodwill impairment			0
Minimum \| Commercial Banking
Segment Reporting Information [Line Items]
Revenues		25
Maximum \| Consumer Banking
Segment Reporting Information [Line Items]
Revenues		25
Maximum \| Commercial Banking
Segment Reporting Information [Line Items]
Revenues		$ 2,500