Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill by Reportable Segment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]
Goodwill	$ 6,369	$ 6,369	$ 6,344
Goodwill, Transfers	0	0
Goodwill, Acquired During Period		32
Goodwill, Impairment Loss	0	(7)	0
Retail Banking [Member]
Goodwill [Line Items]
Goodwill	0	0	4,854
Goodwill, Transfers	0	(4,854)
Goodwill, Acquired During Period		0
Goodwill, Impairment Loss		0
Diversified Commercial Banking [Member]
Goodwill [Line Items]
Goodwill	0	0	928
Goodwill, Transfers	0	(928)
Goodwill, Acquired During Period		0
Goodwill, Impairment Loss		0
Corporate and Investment Banking [Member]
Goodwill [Line Items]
Goodwill	0	0	180
Goodwill, Transfers	0	(180)
Goodwill, Acquired During Period		0
Goodwill, Impairment Loss		0
Wealth and Investment Management [Member]
Goodwill [Line Items]
Goodwill	0	0	382
Goodwill, Transfers	0	(382)
Goodwill, Acquired During Period		0
Goodwill, Impairment Loss		0
Consumer Banking and Private Wealth Management [Member]
Goodwill [Line Items]
Goodwill	4,262	3,962	0
Goodwill, Transfers	300	3,930
Goodwill, Acquired During Period		32
Goodwill, Impairment Loss		0
Wholesale Banking [Member]
Goodwill [Line Items]
Goodwill	2,107	2,407	0
Goodwill, Transfers	(300)	2,414
Goodwill, Acquired During Period		0
Goodwill, Impairment Loss		$ (7)
Consumer Banking and Private Wealth Management [Member]
Goodwill [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	56.00%
Wholesale Banking [Member]
Goodwill [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	14.00%
Ridgeworth Capital Management [Member]
Goodwill [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	141.00%