v3.26.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2026
Apr. 28, 2026
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Entity Registrant Name PACCAR FINANCIAL CORP  
Entity Central Index Key 0000731288  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   145,000
Entity Shell Company false  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity File Number 001-11677  
Entity Tax Identification Number 91-6029712  
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 468-7100  
Entity Incorporation, State or Country Code WA  
Document Quarterly Report true  
Title of Each Class Series P Medium-Term Notes $300.0 Million Due May 11, 2026  
Document Transition Report false  
Trading Symbol PCAR26  
Name of Each Exchange on Which Registered NASDAQ