Discontinued Operations - Additional Information (Detail) (Credit Card Receivable [Member], USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	May 01, 2012
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost or fair value adjustments	$ 107,000,000	$ 440,000,000
Cash consideration received upon sale of discontinued operations			$ 19,200,000,000