Goodwill and Other Intangible Assets - by Business Segment (Details 1) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]
Total goodwill	$ 48,057	$ 48,067	$ 48,175	$ 48,131	$ 48,208	$ 48,188
Consumer & Community Banking
Goodwill [Line Items]
Total goodwill	30,971		31,048
Corporate & Investment Bank
Goodwill [Line Items]
Total goodwill	6,869		6,895
Commercial Banking
Goodwill [Line Items]
Total goodwill	2,862		2,863
Asset Management
Goodwill [Line Items]
Total goodwill	6,978		6,992
Corporate/Private Equity
Goodwill [Line Items]
Total goodwill	$ 377		$ 377