Discontinued Operations - Additional Information (Detail) (Credit Card Receivable [Member], USD $)	1 Months Ended
	Jan. 31, 2012	May 31, 2012
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost or fair value adjustments	$ 333,000,000
Cash consideration received upon sale of discontinued operations		$ 19,200,000,000