Finance Receivables Delinquency (Details) (USD $) In Millions, unless otherwise specified	Jun. 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	3.40%	4.10%
Financing Receivable, Recorded Investment, Past Due	$ 645	$ 428
31-to-60 days [Member] | North America [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	601
31-to-60 days [Member] | International [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	44
Greater-than-60 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Percent of Contractual Amount Due	1.40%	1.50%
Financing Receivable, Recorded Investment, Past Due	253	158
Greater-than-60 Days [Member] | North America [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	208
Greater-than-60 Days [Member] | International [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	45
Greater-than-30 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Percent of Contractual Amount Due	4.80%	5.60%
Financing Receivable, Recorded Investment, Past Due	898	586
Greater-than-30 Days [Member] | North America [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	809
Greater-than-30 Days [Member] | International [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	89
Delinquent Contract in Repossession [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Percent of Contractual Amount Due	0.20%	0.30%
Financing Receivable, Recorded Investment, Past Due	35	25
Delinquent Contract in Repossession [Member] | North America [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	31
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	5.00%	5.90%
Financing Receivable, Recorded Investment, Past Due	933	611
Deliquent Contract Past Due Account [Member] | North America [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	840
Deliquent Contract Past Due Account [Member] | International [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 93