Finance Receivables Activity in post-acquisition consumer finance receivables portfolio (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing Receivable, Gross		$ 560
Consumer Finance Receivables
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing Receivable, Gross	23,130
International Segment [Member] | Consumer Finance Receivables
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing Receivable, Gross	11,742
North America Segment [Member] | Consumer Finance Receivables
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing Receivable, Gross	11,388	10,789
Post-Acquisition Portfolio | Consumer Finance Receivables
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing Receivable, Gross	8,831
Business Combination, Acquired Receivables, Fair Value	9,709
Payments to Acquire Loans Receivable	9,597
Financing Receivable, Allowance for Credit Losses, Write-downs	(638)
Proceeds from Collection of Finance Receivables	(5,697)
Finance Receivable Change in Carrying Value Adjustment	14
Foreign Currency Translation - Finance Receivables	140
Financing Receivable, Gross	21,956
Post-Acquisition Portfolio | International Segment [Member] | Consumer Finance Receivables
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Business Combination, Acquired Receivables, Fair Value	9,709
Payments to Acquire Loans Receivable	4,471
Financing Receivable, Allowance for Credit Losses, Write-downs	(54)
Proceeds from Collection of Finance Receivables	(2,886)
Finance Receivable Change in Carrying Value Adjustment	14
Foreign Currency Translation - Finance Receivables	140
Financing Receivable, Gross	11,394
Post-Acquisition Portfolio | North America Segment [Member] | Consumer Finance Receivables
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing Receivable, Gross	8,831	5,314	924
Payments to Acquire Loans Receivable	5,126	5,579	5,085
Financing Receivable, Allowance for Credit Losses, Write-downs	(584)	(304)	(66)
Proceeds from Collection of Finance Receivables	(2,811)	(1,758)	(629)
Financing Receivable, Gross	$ 10,562	$ 8,831	$ 5,314