|**Fair Value Measurements (Tables)**                   | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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|**Fair Value Disclosures [Abstract]**                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Fair values of financial instruments                   | Financial instruments not carried at fair value were as follows:(Millions of dollars)June 30, 2023December 31, 2022CarryingAmountFairValueCarryingAmountFairValueFair ValueLevelsReferenceAssetsFinance receivables, net (excluding finance leases(1))$20,217$19,535$19,085$18,4483Note 3LiabilitiesLong-term debt$22,573$21,963$21,418$20,6862(1)Represents finance leases and failed sale leasebacks of $7.16 billion and $7.36 billion as of June 30, 2023 and December 31, 2022, respectively.
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|(Millions of dollars)                                  | June 30, 2023                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                       | CarryingAmount                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Assets                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Finance receivables, net (excluding finance leases(1)) | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Liabilities                                            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Long-term debt                                         | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

X- DefinitionTabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.
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