Finance Receivables Aging (Details) (Financial Services [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Financing Receivables [Line Items]
Number Of Days After Which Finance Receivable Is Considered Past Due	any payment, including principal and interest, that has not been collected and is at least 31 days past the contractual due date
Financing Receivable, Gross	$ 76,159	$ 73,831
Consumer [Member]
Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	13	14
Financing Receivable Recorded Investment 31 To 60 Days Past Due	833	796
Financing Receivable Recorded Investment 61 To 90 Days Past Due	115	96
Financing Receivable Recorded Investment 91 To 120 Days Past Due	30	34
Financing Receivable Recorded Investment Greater Than 120 Days Past Due	81	113
Financing Receivable, Recorded Investment, Past Due	1,059	1,039
Financing Receivable, Recorded Investment, Current	47,354	46,712
Financing Receivable, Gross	48,413	47,751
Non-consumer [Member]
Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	5
Financing Receivable, Recorded Investment, Past Due	40	39
Financing Receivable, Recorded Investment, Current	27,706	26,041
Financing Receivable, Gross	27,746	26,080
North America [Member]
Financing Receivables [Line Items]
Financing Receivable, Gross	58,358	54,227
North America [Member] | Consumer [Member]
Financing Receivables [Line Items]
Financing Receivable Recorded Investment 31 To 60 Days Past Due	783	732
Financing Receivable Recorded Investment 61 To 90 Days Past Due	97	68
Financing Receivable Recorded Investment 91 To 120 Days Past Due	21	22
Financing Receivable Recorded Investment Greater Than 120 Days Past Due	52	70
Financing Receivable, Recorded Investment, Past Due	953	892
Financing Receivable, Recorded Investment, Current	37,287	36,111
Financing Receivable, Gross	38,240	37,003
North America [Member] | Non-consumer [Member]
Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, Past Due	29	30
Financing Receivable, Recorded Investment, Current	20,089	17,194
Financing Receivable, Gross	20,118	17,224
International [Member]
Financing Receivables [Line Items]
Financing Receivable, Gross	17,801	19,604
International [Member] | Consumer [Member]
Financing Receivables [Line Items]
Financing Receivable Recorded Investment 31 To 60 Days Past Due	50	64
Financing Receivable Recorded Investment 61 To 90 Days Past Due	18	28
Financing Receivable Recorded Investment 91 To 120 Days Past Due	9	12
Financing Receivable Recorded Investment Greater Than 120 Days Past Due	29	43
Financing Receivable, Recorded Investment, Past Due	106	147
Financing Receivable, Recorded Investment, Current	10,067	10,601
Financing Receivable, Gross	10,173	10,748
International [Member] | Non-consumer [Member]
Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, Past Due	11	9
Financing Receivable, Recorded Investment, Current	7,617	8,847
Financing Receivable, Gross	$ 7,628	$ 8,856
Minimum [Member]
Financing Receivables [Line Items]
Number Of Days At Which Finance Receivables Are In Process Of Collection	90 days