| **Short-Term Borrowings**      | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
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| **Short-term Debt [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Short-Term Borrowings          | SHORT-TERM BORROWINGS Short-term borrowings outstanding as of December 31, were comprised of the following: (Millions of dollars)        2012 2011 2010  Balance Avg. Rate Balance Avg. Rate Balance Avg. RateCommercial paper, net $3,654 0.6% $2,818 1.0% $2,710 1.5%Bank borrowings 418 5.6% 527 7.3% 479 4.9%Variable denomination floating    rate demand notes 579 0.8% 550 0.9% 663 1.1%Total $4,651   $3,895   $3,852                |

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| - Definition
The entire disclosure for short-term debt.
+ References
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