|**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)20232022BalanceWeighted Avg. RateBalanceWeighted Avg. RateMedium-term notes$23,1653.2%$20,8212.2%Unamortized discount and debt issuance costs(34)(37)Fair value adjustments(46)(112)Medium-term notes, net23,08520,672Bank borrowings and other5276.6%7465.3%Total$23,612$21,418
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|(Millions of dollars)                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                   
|                                                                                                           |                                                                                                                                                                                                                                                                                                                                                                                   
|Medium-term notes                                                                                          |                                                                                                                                                                                                                                                                                                                                                                                   
|Unamortized discount and debt issuance costs                                                               |                                                                                                                                                                                                                                                                                                                                                                                   
|Fair value adjustments                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                   
|Medium-term notes, net                                                                                     |                                                                                                                                                                                                                                                                                                                                                                                   
|Bank borrowings and other                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                   
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|Total                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                   
|                                                                                                           |                                                                                                                                                                                                                                                                                                                                                                                   
|Maturities of Long-term debt outstanding (excluding fair value adjustments) in each of the next five years | Maturities of Long-term debt outstanding (excluding fair value adjustments) as of December 31, 2023, in each of the next five years, are as follows:(Millions of dollars)2024$7,71920257,81120265,63420272,479202814                                                                                                                                                              
|                                                                                                           |                                                                                                                                                                                                                                                                                                                                                                                   
|(Millions of dollars)                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                   
|2024                                                                                                       | $                                                                                                                                                                                                                                                                                                                                                                                 
|2025                                                                                                       | 7,811                                                                                                                                                                                                                                                                                                                                                                             
|2026                                                                                                       | 5,634                                                                                                                                                                                                                                                                                                                                                                             
|2027                                                                                                       | 2,479                                                                                                                                                                                                                                                                                                                                                                             
|2028                                                                                                       | 14                                                                                                                                                                                                                                                                                                                                                                                
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