Finance Receivables Aging (Details) (Financial Services [Member], USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Financing Receivables [Line Items]
Number Of Days After Which Finance Receivable Is Considered Past Due	any payment, including principal and interest, that is at least 31 days past the contractual due date
Financing Receivable, Gross	$ 84,862	$ 81,173	$ 78,370
Minimum [Member]
Financing Receivables [Line Items]
Number Of Days At Which Finance Receivables Are In Process Of Collection	90 days
Consumer [Member]
Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	15	14
Financing Receivable Recorded Investment 31 To 60 Days Past Due	624	754
Financing Receivable Recorded Investment 61 To 90 Days Past Due	89	105
Financing Receivable Recorded Investment 91 To 120 Days Past Due	26	27
Financing Receivable Recorded Investment Greater Than 120 Days Past Due	62	63
Financing Receivable, Recorded Investment, Past Due	801	949
Financing Receivable, Recorded Investment, Current	52,770	49,248
Financing Receivable, Gross	53,571	50,197
Non-consumer [Member]
Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	3	21
Financing Receivable, Recorded Investment, Past Due	95	89
Financing Receivable, Recorded Investment, Current	31,196	30,887
Financing Receivable, Gross	31,291	30,976
North America [Member]
Financing Receivables [Line Items]
Financing Receivable, Gross	64,228	62,451
North America [Member] | Consumer [Member]
Financing Receivables [Line Items]
Financing Receivable Recorded Investment 31 To 60 Days Past Due	583	715
Financing Receivable Recorded Investment 61 To 90 Days Past Due	70	88
Financing Receivable Recorded Investment 91 To 120 Days Past Due	17	18
Financing Receivable Recorded Investment Greater Than 120 Days Past Due	40	37
Financing Receivable, Recorded Investment, Past Due	710	858
Financing Receivable, Recorded Investment, Current	41,316	38,789
Financing Receivable, Gross	42,026	39,647
North America [Member] | Non-consumer [Member]
Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, Past Due	3	49
Financing Receivable, Recorded Investment, Current	22,199	22,755
Financing Receivable, Gross	22,202	22,804
International [Member]
Financing Receivables [Line Items]
Financing Receivable, Gross	20,634	18,722
International [Member] | Consumer [Member]
Financing Receivables [Line Items]
Financing Receivable Recorded Investment 31 To 60 Days Past Due	41	39
Financing Receivable Recorded Investment 61 To 90 Days Past Due	19	17
Financing Receivable Recorded Investment 91 To 120 Days Past Due	9	9
Financing Receivable Recorded Investment Greater Than 120 Days Past Due	22	26
Financing Receivable, Recorded Investment, Past Due	91	91
Financing Receivable, Recorded Investment, Current	11,454	10,459
Financing Receivable, Gross	11,545	10,550
International [Member] | Non-consumer [Member]
Financing Receivables [Line Items]
Financing Receivable, Recorded Investment, Past Due	92	40
Financing Receivable, Recorded Investment, Current	8,997	8,132
Financing Receivable, Gross	$ 9,089	$ 8,172