Discontinued Operations - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended		3 Months Ended					3 Months Ended	9 Months Ended		15 Months Ended
	Sep. 30, 2011 Credit Card Receivables [Member]	Sep. 30, 2012 Credit Card Receivables [Member]	Sep. 30, 2011 Credit Card Receivables [Member]	Dec. 31, 2010 Bank Note [Member]	Sep. 30, 2010 Bank Note [Member]	Sep. 30, 2012 Bank Note [Member]	Dec. 31, 2011 Bank Note [Member]	Oct. 31, 2010 Bank Note [Member]	Sep. 30, 2011 Bank Note [Member] Credit Card Receivables [Member]	Sep. 30, 2012 Bank Note [Member] Credit Card Receivables [Member]	Sep. 30, 2011 Bank Note [Member] Credit Card Receivables [Member]	Sep. 30, 2012 Bank Note [Member] Credit Card Receivables [Member]	May 01, 2012 Bank Note [Member] Credit Card Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost or fair value adjustments	$ 159,000,000	$ 440,000,000	$ 159,000,000		$ 12,000,000				$ 159,000,000	$ 440,000,000	$ 159,000,000	$ 1,000,000,000
Cash consideration received upon sale of discontinued operations													19,200,000,000
Closure costs primarily relating to termination and other employee				14,000,000
Assets and liabilities of Banknotes Business reported of discontinued operations					23,000,000	0	0
Allocation of goodwill as held for sale					21,000,000
Cash consideration received upon sale of discontinued operations								$ 11,000,000