Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill by Reportable Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Dec. 31, 2013
Goodwill [Line Items]
Goodwill	$ 6,377		$ 6,369
Goodwill, Acquired During Period	8	[1]
Consumer Banking and Private Wealth Management [Member]
Goodwill [Line Items]
Goodwill	4,262		4,262
Goodwill, Acquired During Period	0
Wholesale Banking [Member]
Goodwill [Line Items]
Goodwill	2,115		2,107
Goodwill, Acquired During Period	$ 8	[1]

[1] Assets and liabilities obtained through the acquisition were immaterial to the financial statements at March 31, 2014.