Goodwill and Other Intangible Assets - by Business Segment (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Goodwill [Line Items]
Total goodwill	$ 47,970	$ 48,110	$ 48,081	$ 48,100	$ 48,057	$ 48,175
Consumer & Community Banking
Goodwill [Line Items]
Total goodwill	30,962		30,985
Corporate & Investment Bank
Goodwill [Line Items]
Total goodwill	6,873		6,888
Commercial Banking
Goodwill [Line Items]
Total goodwill	2,861		2,862
Asset Management
Goodwill [Line Items]
Total goodwill	6,965		6,969
Corporate/Private Equity
Goodwill [Line Items]
Total goodwill	$ 309		$ 377