Finance Receivables Delinquency (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013 Rate	Dec. 31, 2012 Rate
31-to-60 days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Percent of Contractual Amount Due	3.80%	5.20%
Financing Receivable, Recorded Investment, Past Due	$ 739	$ 561
31-to-60 days [Member] | North America [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	690
31-to-60 days [Member] | International [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	49
Greater-than-60 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Percent of Contractual Amount Due	1.50%	1.90%
Financing Receivable, Recorded Investment, Past Due	291	204
Greater-than-60 Days [Member] | North America [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	247
Greater-than-60 Days [Member] | International [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	44
Greater-than-30 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Percent of Contractual Amount Due	5.30%	7.10%
Financing Receivable, Recorded Investment, Past Due	1,030	765
Greater-than-30 Days [Member] | North America [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	937
Greater-than-30 Days [Member] | International [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	93
Delinquent Contract in Repossession [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Percent of Contractual Amount Due	0.30%	0.30%
Financing Receivable, Recorded Investment, Past Due	45	38
Delinquent Contract in Repossession [Member] | North America [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	41
Delinquent Contract in Repossession [Member] | International [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	4
Deliquent Contract Past Due Account [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Percent of Contractual Amount Due	5.60%	7.40%
Financing Receivable, Recorded Investment, Past Due	1,075	803
Deliquent Contract Past Due Account [Member] | North America [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	978
Deliquent Contract Past Due Account [Member] | International [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 97