Goodwill and Other Intangible Assets - Components of Goodwill and Other Intangible Assets (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Schedule of Intangible Assets by Major Class [Line Items]
Goodwill, Gross Carrying Value	$ 13,970,000,000	$ 13,978,000,000
Goodwill, Net Carrying Value	13,970,000,000	13,978,000,000
Amortized intangible assets, Carrying Amount of Assets	4,197,000,000	4,212,000,000
Amortized intangible assets, Accumulated Amortization	(2,757,000,000)	(2,363,000,000)
Amortized intangible assets, Net Carrying Value	1,440,000,000	1,849,000,000
Total goodwill and other intangible assets, Carrying Amount of Assets	18,167,000,000	18,190,000,000
Total goodwill and other intangible assets, Net Carrying Value	15,410,000,000	15,827,000,000
Consumer MSRs	58,000,000	73,000,000
Commercial MSRs, Carrying Amount of Assets	153,000,000	135,000,000
MSRs, Accumulated Amortization	(18,000,000)	(3,000,000)
Commercial MSRs, Net Carrying Amount	135,000,000	132,000,000
Servicing Asset, Carrying Amount of Assets	211,000,000	208,000,000
Servicing Asset, Net Carrying Amount	193,000,000	205,000,000
Indefinite lived assets	4,000,000	4,000,000
MSRs impaired	0
Valuation allowance recorded	0	0
Purchased credit card relationship intangibles (“PCCR”)
Schedule of Intangible Assets by Major Class [Line Items]
Amortized intangible assets, Carrying Amount of Assets	2,125,000,000	2,125,000,000
Amortized intangible assets, Accumulated Amortization	(1,066,000,000)	(784,000,000)
Amortized intangible assets, Net Carrying Value	1,059,000,000	1,341,000,000
Core deposit intangibles
Schedule of Intangible Assets by Major Class [Line Items]
Amortized intangible assets, Carrying Amount of Assets	1,771,000,000	1,771,000,000
Amortized intangible assets, Accumulated Amortization	(1,540,000,000)	(1,440,000,000)
Amortized intangible assets, Net Carrying Value	231,000,000	331,000,000
Other
Schedule of Intangible Assets by Major Class [Line Items]
Amortized intangible assets, Carrying Amount of Assets	301,000,000	316,000,000
Amortized intangible assets, Accumulated Amortization	(151,000,000)	(139,000,000)
Amortized intangible assets, Net Carrying Value	$ 150,000,000	$ 177,000,000