| **Long-Term Debt (Tables)**                       | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
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| **Long-term Debt, Unclassified [Abstract]**       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Long-term debt                                    | 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                |
| Aggregate amounts of maturities of long-term debt |  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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| - Definition
Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.
+ References
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| - Definition
Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented.
+ References
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