Intangible Assets (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2012	Dec. 31, 2011
Intangible Assets (Textual) [Abstract]
Residential mortgage banking revenue service fees	$ 22	$ 28	$ 47	$ 56
Commercial mortgage servicing rights	7		7			7
Purchased from HSBC Finance account of Credit Card					746
Credit card receivables not being sold to Capital One at a fair value					108
Fair value of Intangible asset related to account relationships purchased include in branch sale					43
Other intangible assets are comprised of Favourable lease arrangements	10		10			12
Other intangible assets result from purchase of business combinations from customer	1		1			3
Purchased credit card relationships [Member]
Indefinite-lived Intangible Assets [Line Items]
Fair value of Intangible asset related to account relationships purchased retained					$ 65