Goodwill and Other Intangible Assets - by Business Segment (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]
Total goodwill	$ 47,647	$ 48,081	$ 48,175	$ 48,188
Consumer & Community Banking
Goodwill [Line Items]
Total goodwill	30,941	30,985	31,048
Corporate & Investment Bank
Goodwill [Line Items]
Total goodwill	6,780	6,888	6,895
Commercial Banking
Goodwill [Line Items]
Total goodwill	2,861	2,862	2,863
Asset Management
Goodwill [Line Items]
Total goodwill	6,964	6,969	6,992
Corporate
Goodwill [Line Items]
Total goodwill	$ 101	$ 377	$ 377