Intangible Assets, Allocation of Goodwill to Operating Segments (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 25,637
Goodwill, Written off Related to Sale of Business Unit	(11)
Goodwill, Acquired During Period	87
Goodwill, Other Changes	(8)
Goodwill, Ending Balance	25,705
Goodwill	25,637	$ 25,705	$ 25,705
Community Banking [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	17,922
Goodwill, Written off Related to Sale of Business Unit	0
Goodwill, Acquired During Period	0
Goodwill, Other Changes	(8)
Goodwill, Ending Balance	17,914
Goodwill	17,922	17,914	17,914
Wholesale Banking [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	7,344
Goodwill, Written off Related to Sale of Business Unit	(11)
Goodwill, Acquired During Period	87
Goodwill, Other Changes	0
Goodwill, Ending Balance	7,420
Goodwill	7,344	7,420	7,420
Wealth, Brokerage and Retirement [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	371
Goodwill, Written off Related to Sale of Business Unit	0
Goodwill, Acquired During Period	0
Goodwill, Other Changes	0
Goodwill, Ending Balance	371
Goodwill	$ 371	$ 371	$ 371