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Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2021
Jun. 30, 2021
Entity Information [Line Items]    
Document Type 10-K  
Document Annual Report true  
Document Period End Date Dec. 31, 2021  
Document Transition Report false  
Entity File Number 1-768  
Entity Registrant Name CATERPILLAR INC  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 37-0602744  
Entity Address, Address Line One 510 Lake Cook Road,  
Entity Address, Address Line Two Suite 100,  
Entity Address, City or Town Deerfield,  
Entity Address, State or Province IL  
Entity Address, Postal Zip Code 60015  
City Area Code 224  
Local Phone Number 551-4000  
Entity Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Public Float   $ 118.1
Entity Common Stock, Shares Outstanding 535,888,051  
Entity Central Index Key 0000018230  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus FY  
ICFR Auditor Attestation Flag true  
Documents Incorporated by Reference
Documents Incorporated by Reference
 
Portions of the documents listed below have been incorporated by reference into the indicated parts of this Form 10-K, as specified in the responses to the item numbers involved.
 
Part III2022 Annual Meeting Proxy Statement (Proxy Statement) to be filed with the Securities and Exchange Commission (SEC) within 120 days after the end of the fiscal year.
  
Common Stock ($1.00 par value)    
Entity Information [Line Items]    
Title of 12(b) Security Common Stock ($1.00 par value)  
Trading Symbol CAT  
Security Exchange Name NYSE  
8% Debentures due February 15, 2023    
Entity Information [Line Items]    
Title of 12(b) Security 8% Debentures due February 15, 2023  
Trading Symbol CAT23  
Security Exchange Name NYSE  
5.3% Debentures due September 15, 2035    
Entity Information [Line Items]    
Title of 12(b) Security 5.3% Debentures due September 15, 2035  
Trading Symbol CAT35  
Security Exchange Name NYSE