| **Equipment on Operating Leases (Tables)**                                        | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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| **Leases [Abstract]**                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Equipment leased to others                                                        | Components of equipment on operating leases, less accumulated depreciation as of December 31, were as follows: (Millions of dollars)        2012 2011 2010Equipment on operating leases, at cost $4,410 $4,082 $4,241Less: Accumulated depreciation (1,451) (1,471) (1,530)Equipment on operating leases, net $2,959 $2,611 $2,711        |
| Schedule of minimum rental payments to be received for equipment leased to others | At December 31, 2012, scheduled minimum rental payments for operating leases were as follows: 2013 2014 2015 2016 2017 Thereafter Total$754 $523 $318 $172 $63 $19 $1,849                                                                                                                                                                                                                                  |

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| - Definition
This element represents the schedule of minimum rental payments to be received for equipment leased to others.
+ References
No definition available.
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| X                                                                                                                                                  |
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| - Details**Name:**us-gaap_LeasesAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| - Definition
Tabular disclosure of lessor's property under leasing agreements and property available for lease (not currently under lease) by property class, the gross amount, accumulated depreciation and net amount of  as of the balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 23 -Subparagraph b(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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