Finance Receivables, Net, Sale of Finance Receivables (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended				12 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net carrying value (NCV) sold									$ 676	$ 682
Allowance included in NCV									17	18
Cash proceeds received									635	630
Beneficial interests received									86	101
Net fees and expenses									5	5
Finance receivables sold and derecognized principal value	766				766				1,006
Finance receivables sold and derecognized sales value	834				834				1,098
Beneficial Interest, Interest in Other Current Assets	112				112				150
Beneficial interest from sale of finance receivables	92				92				124
Finance Receivable Beneficial Interest Weighted Average Life					2 years
Collections on beneficial interest	21		25		42		27
Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre-tax gain on sales									40	44
Impact from prior sales of finance receivables	(137)	[1]	(83)	[1]	(286)	[1]	(174)	[1]
Collections on beneficial interest	25		25		51		27
Estimated Decrease to Operating Cash Flows	$ (112)		$ (58)		$ (235)		$ (147)

[1] Represents cash that would have been collected had we not sold finance receivables.