Discontinued Operations - Additional Information (Details) (Credit Card Receivable [Member], USD $)	12 Months Ended		24 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	May 01, 2012
Credit Card Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost or fair value adjustments	$ 440,000,000	$ 604,000,000	$ 1,000,000,000
Cash consideration received upon sale of discontinued operations						19,200,000,000
Discontinued operations, Assets				0	0
Discontinued operations, Liabilities				$ 0	$ 0