| **Long-Term Debt** | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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| **Long-Term Debt** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Long-Term Debt     | NOTE 7 – 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. Rate                     Medium-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 $5,102 2013  5,816 2014  4,664 2015  987 2016  1,775  Thereafter  3,287 Total $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
This element may be used as a single block of text to encapsulate the entire disclosure for long-term borrowings including data and tables.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5
+ Details**Name:**us-gaap_LongTermDebtTextBlock**Namespace Prefix:**us-gaap_**Data Type:**us-types:textBlockItemType**Balance Type:**na**Period Type:**duration |