Goodwill and Other Intangible Assets - by Business Segment (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill [Line Items]
Total goodwill	$ 48,175	$ 48,188	$ 48,854	$ 48,357
Consumer & Community Banking [Member]
Goodwill [Line Items]
Total goodwill	31,048	30,996	31,018
Corporate & Investment Bank [Member]
Goodwill [Line Items]
Total goodwill	6,895	6,944	6,958
Commercial Banking [Member]
Goodwill [Line Items]
Total goodwill	2,863	2,864	2,866
Asset Management [Member]
Goodwill [Line Items]
Total goodwill	6,992	7,007	7,635
Corporate Private Equity [Member]
Goodwill [Line Items]
Total goodwill	$ 377	$ 377	$ 377