Discontinued Operations - Results of Discontinued Operations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Income (loss) from discontinued operations before income tax (benefit) expense		$ 218	$ 315	$ 682
Bank Note [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net interest income and other revenues				19
Income (loss) from discontinued operations before income tax (benefit) expense				(1)
Credit Card Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net interest income and other revenues		492	541	1,598
Income (loss) from discontinued operations before income tax (benefit) expense		$ 218	$ 315	$ 683