Intangible Assets - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Service fees		$ 44,000,000,000
Residential mortgage banking revenue service fees		79,000,000	87,000,000	109,000,000
Intangible assets, net		295,000,000	247,000,000
Purchased from HSBC FInance account of credit card	746,000,000
Credit card receivables not being sold to Capital One at a fair value	108,000,000
Fair value of Intangible asset related to account relationships purchased include in branch sale	43,000,000
Fair value of Intangible asset related to account relationships purchased retained	65,000,000
Useful life	10 years
Mortgage Servicing Rights - Commercial Real Estate [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, net		$ 10,000,000	$ 11,000,000