Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill by Reportable Segment (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Goodwill [Roll Forward]
Goodwill	$ 6,369	$ 6,369
Goodwill, Transfers		0
Goodwill, Acquired During Period	8
Goodwill, Written off Related to Sale of Business Unit	(40)
Goodwill	6,337	6,369
Consumer Banking and Private Wealth Management [Member]
Goodwill [Roll Forward]
Goodwill	4,262	3,962
Goodwill, Transfers		300
Goodwill, Acquired During Period	0
Goodwill, Written off Related to Sale of Business Unit	0
Goodwill	4,262	4,262
Wholesale Banking [Member]
Goodwill [Roll Forward]
Goodwill	2,107	2,407
Goodwill, Transfers		(300)
Goodwill, Acquired During Period	8
Goodwill, Written off Related to Sale of Business Unit	(40)
Goodwill	$ 2,075	$ 2,107