|**Transactions with Related Parties (Tables)**           | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|**Related Party Transactions [Abstract]**                |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Transactions with related parties                        | Information concerning these agreements was as follows: (Millions of dollars)202420232022Payable to Caterpillar - borrowings as of December 31,$10$24$23Payable to Caterpillar - other as of December 31,118113101Notes receivable from Caterpillar as of December 31,559527482Other receivables from Caterpillar as of December 31,(2)8539133Interest expense111Interest income on Notes Receivable with Caterpillar(1)232117(1)Included in Other revenues, net in the Consolidated Statements of Profit.(2)Included in Other assets in the Consolidated Statements of Financial Position.We have agreements with Caterpillar to purchase certain trade receivables at a discount. In addition, we receive fee revenue from Caterpillar for our centralized activities benefiting the global factoring program. Cash flows related to our factoring programs with Caterpillar are included in Net changes in Caterpillar purchased receivables within investing activities in the Consolidated Statements of Cash Flows. Information pertaining to these purchases was as follows:(Millions of dollars)202420232022Purchases made$52,930$53,382$47,158Revenue earned625617417Purchased Receivables as of December 31,4,2833,9494,297
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|(Millions of dollars)                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Payable to Caterpillar - borrowings as of December 31,   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Payable to Caterpillar - other as of December 31,        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Notes receivable from Caterpillar as of December 31,     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Other receivables from Caterpillar as of December 31,(2) |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Interest expense                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Interest income on Notes Receivable with Caterpillar(1)  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|(Millions of dollars)                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Purchases made                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Revenue earned                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Purchased Receivables as of December 31,                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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X- ReferencesNo definition available.+ Details**Name:**us-gaap_RelatedPartyTransactionsAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration X- DefinitionTabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates.+ ReferencesNo definition available.+ Details**Name:**us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock**Namespace Prefix:**us-gaap_**Data Type:**dtr-types:textBlockItemType**Balance Type:**na**Period Type:**duration