Finance Receivables, Net, Sale of Finance Receivables (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended				12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 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	654				654				1,006
Finance receivables sold and derecognized sales value	711				711				1,098
Beneficial Interest, Interest in Other Current Assets	93				93				150
Beneficial interest from sale of finance receivables	77				77				124
Finance Receivable Beneficial Interest Weighted Average Life					2 years
Collections on beneficial interest	20		16		62		43
Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cash proceeds received	0	[1]	384	[1]	0	[1]	384	[1]
Pre-tax gain on sales									40	44
Impact from prior sales of finance receivables	(125)	[2]	(84)	[2]	(411)	[2]	(258)	[2]
Collections on beneficial interest	23		16		74		43
Estimated (Decrease) Increase to Operating Cash Flows	$ (102)		$ 316		$ (337)		$ 169

[1] Net of beneficial interest, fees and expenses.

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