XML 15 R1.htm IDEA: XBRL DOCUMENT v3.20.4
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Jan. 31, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Registrant Name PACCAR Inc    
Entity Central Index Key 0000075362    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   346,936,820  
Entity Public Float     $ 25,440
Entity File Number 001-14817    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 91-0351110    
Entity Address, Address Line One 777 - 106th Ave. N.E.    
Entity Address, City or Town Bellevue    
Entity Address, State or Province WA    
Entity Address, Postal Zip Code 98004    
City Area Code 425    
Local Phone Number 468-7400    
Document Transition Report false    
Document Annual Report true    
ICFR Auditor Attestation Flag true    
Title of Each Class Common Stock, $1 par value    
Trading Symbol PCAR    
Name of Each Exchange on Which Registered NASDAQ    
Documents Incorporated by Reference

Portions of the proxy statement for the annual stockholders meeting to be held on April 27, 2021 are incorporated by reference into Part III.