| **Long-Term Debt**                          | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| **Long-term Debt, Unclassified [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Long-Term Debt                              | LONG-TERM DEBT During 2011, we issued $5.647 billion of medium-term notes, of which $4.228 billion were at fixed interest rates and $1.419 billion were at floating interest rates, primarily indexed to LIBOR.  At December 31, 2011, the outstanding medium-term notes had remaining maturities ranging up to 17 years. Long-term debt outstanding as of December 31, was comprised of the following: (Millions of dollars) 2011 2010 2009  Balance Avg. Rate Balance Avg. Rate Balance Avg. RateMedium-term notes $20,058 3.9% $17,690 4.6% $20,271 4.6%Unamortized discount (10)   (9)   (13)  Medium-term notes, net 20,048   17,681   20,258  Bank borrowings 1,583 3.7% 1,603 3.8% 1,265 5.4%Secured Borrowings —   78 4.9% —     Total $21,631   $19,362   $21,523                Long-term debt outstanding as of December 31, 2011, matures as follows: (Millions of dollars) 2012$5,10220135,81620144,664201598720161,775Thereafter3,287Total$21,631  The above table includes $220 million of medium-term notes that could be called by us at some point in the future at par value. |

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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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