|**Certain Changes in Total Equity (Tables)**                            | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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|**Equity [Abstract]**                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Schedule of Changes in Accumulated Other Comprehensive Loss, Net of Tax | The following table provides the changes, net of tax, inAccumulated other comprehensive loss, excluding noncontrolling interests:Net Unrealized Gains/(Losses)Benefit Plans(MILLIONS OF DOLLARS)Currency Translation Adjustments and OtherDerivative Financial InstrumentsAvailable-For-Sale SecuritiesActuarial Gains/(Losses)Prior Service (Costs)/ Credits and OtherAccumulated Other Comprehensive LossBalance, December 31, 2012$(177)$(88)$163$(6,110)$259$(5,953)Other comprehensive income/(loss)(a)(360)(23)(13)208(14)(202)Balance, March 31, 2013$(537)$(111)$150$(5,902)$245$(6,155)(a)Amounts do not include foreign currency translation loss of$3 millionattributable to noncontrolling interests for the first quarter of2013.
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|(MILLIONS OF DOLLARS)                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Balance, December 31, 2012                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Other comprehensive income/(loss)(a)                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Balance, March 31, 2013                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
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|(a)                                                                     | Amounts do not include foreign currency translation loss of$3 millionattributable to noncontrolling interests for the first quarter of2013.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

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