Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014
Goodwill [Line Items]
Goodwill		$ 6,369
Goodwill, Transfers		8
Goodwill, Written off Related to Sale of Business Unit	$ 40
Goodwill	6,337	6,337
Consumer Banking and Private Wealth Management [Member]
Goodwill [Line Items]
Goodwill		4,262
Goodwill, Transfers		0
Goodwill, Written off Related to Sale of Business Unit	0
Goodwill	4,262	4,262
Wholesale Banking [Member]
Goodwill [Line Items]
Goodwill		2,107
Goodwill, Transfers		8
Goodwill, Written off Related to Sale of Business Unit	40
Goodwill	$ 2,075	$ 2,075