Finance Receivables Aging (Details) (Financial Services [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
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	$ 76,939	$ 76,159	$ 72,707
Consumer [Member]
Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	12	13
Financing Receivable Recorded Investment 31 To 60 Days Past Due	619	833
Financing Receivable Recorded Investment 61 To 90 Days Past Due	73	115
Financing Receivable Recorded Investment 91 To 120 Days Past Due	25	30
Financing Receivable Recorded Investment Greater Than 120 Days Past Due	68	81
Financing Receivable, Recorded Investment, Past Due	785	1,059
Financing Receivable, Recorded Investment, Current	47,043	47,354
Financing Receivable, Gross	47,828	48,413
Non-consumer [Member]
Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	2	5
Financing Receivable, Recorded Investment, Past Due	20	40
Financing Receivable, Recorded Investment, Current	29,091	27,706
Financing Receivable, Gross	29,111	27,746
North America [Member]
Financing Receivables [Line Items]
Financing Receivable, Gross	59,285	58,358
North America [Member] | Consumer [Member]
Financing Receivables [Line Items]
Financing Receivable Recorded Investment 31 To 60 Days Past Due	583	783
Financing Receivable Recorded Investment 61 To 90 Days Past Due	57	97
Financing Receivable Recorded Investment 91 To 120 Days Past Due	16	21
Financing Receivable Recorded Investment Greater Than 120 Days Past Due	41	52
Financing Receivable, Recorded Investment, Past Due	697	953
Financing Receivable, Recorded Investment, Current	37,593	37,287
Financing Receivable, Gross	38,290	38,240
North America [Member] | Non-consumer [Member]
Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, Past Due	12	29
Financing Receivable, Recorded Investment, Current	20,983	20,089
Financing Receivable, Gross	20,995	20,118
International [Member]
Financing Receivables [Line Items]
Financing Receivable, Gross	17,654	17,801
International [Member] | Consumer [Member]
Financing Receivables [Line Items]
Financing Receivable Recorded Investment 31 To 60 Days Past Due	36	50
Financing Receivable Recorded Investment 61 To 90 Days Past Due	16	18
Financing Receivable Recorded Investment 91 To 120 Days Past Due	9	9
Financing Receivable Recorded Investment Greater Than 120 Days Past Due	27	29
Financing Receivable, Recorded Investment, Past Due	88	106
Financing Receivable, Recorded Investment, Current	9,450	10,067
Financing Receivable, Gross	9,538	10,173
International [Member] | Non-consumer [Member]
Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, Past Due	8	11
Financing Receivable, Recorded Investment, Current	8,108	7,617
Financing Receivable, Gross	$ 8,116	$ 7,628
Minimum [Member]
Financing Receivables [Line Items]
Number Of Days At Which Finance Receivables Are In Process Of Collection	90 days