Finance Receivables, Net Sale of Finance Receivables (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				12 Months Ended
	Mar. 31, 2014		Mar. 31, 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	874				1,006
Finance receivables sold and derecognized sales value	952				1,098
Beneficial Interest, Interest in Other Current Assets	130				150
Beneficial interest from sale of finance receivables	108				124
Finance Receivable Beneficial Interest Weighted Average Life	2 years
Collections on beneficial interest from sales of finance receivables	21		2
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(1)	(149)	[1]	(91)	[1]
Collections on beneficial interest from sales of finance receivables	26		2
Estimated Decrease to Operating Cash Flows	$ (123)		$ (89)

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