Goodwill and Other Intangible Assets - by Business Segment (Details) - USD ($) $ in Millions	Dec. 31, 2015	Jan. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill	$ 47,325		$ 47,647	$ 48,081	$ 48,175
Consumer & Community Banking
Goodwill [Line Items]
Goodwill	30,769		30,941	30,985
Corporate & Investment Bank
Goodwill [Line Items]
Goodwill	6,772		6,780	6,888
Commercial Banking
Goodwill [Line Items]
Goodwill	2,861		2,861	2,862
Asset Management
Goodwill [Line Items]
Goodwill	6,923		6,964	6,969
Corporate
Goodwill [Line Items]
Goodwill	$ 0	$ 101	$ 101	$ 377