GOODWILL -Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			324 Months Ended	6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014 business	Jun. 30, 2013
Goodwill [Line Items]
Number of acquisitions of banks or assets of banks				25
Goodwill impairment	$ 0	$ 4,435	$ 0
Consumer Banking
Goodwill [Line Items]
Goodwill accumulated impairment loss	5,900	5,900		5,900
Goodwill impairment		4,435			4,400
Commercial Banking
Goodwill [Line Items]
Goodwill accumulated impairment loss	50	50		50
Goodwill impairment		$ 0