| **Long-Term Debt**                          | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
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| **Long-term Debt, Unclassified [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Long-Term Debt                              | LONG-TERM DEBT During 2013, we issued $6.15 billion of medium-term notes, of which $3.99 billion were at fixed interest rates and $2.16 billion were at floating interest rates, primarily indexed to LIBOR.  At December 31, 2013, the outstanding medium-term notes had remaining maturities ranging up to 12 years. Long-term debt outstanding as of December 31, was comprised of the following: (Millions of dollars)        2013 2012 2011  Balance Avg. Rate Balance Avg. Rate Balance Avg. RateMedium-term notes $23,837 2.8% $23,488 3.2% $20,058 3.9%Unamortized discount (8)   (13)   (10)  Medium-term notes, net 23,829   23,475   20,048  Bank borrowings 1,483 3.2% 1,602 4.1% 1,583 3.7%Total $25,312   $25,077   $21,631                Long-term debt outstanding as of December 31, 2013, matures as follows: (Millions of dollars) 2014$6,59220156,44620164,79620172,74720182,350Thereafter2,381Total$25,312   |

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| - Details**Name:**us-gaap_LongTermDebtAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
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| - Definition
The entire disclosure for long-term debt.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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