v3.26.1
Transactions with Parties in Interest - Additional Information (Details) - EBP 002 - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
EBP, Related Party and Party-in-Interest Transactions [Line Items]    
Investments Issued by affiliates held $ 2,975,548,042 $ 2,792,943,297
Trustee    
EBP, Related Party and Party-in-Interest Transactions [Line Items]    
Investments Issued by affiliates held 1,174,555,893 1,039,543,187
PACCAR Inc Common Stock    
EBP, Related Party and Party-in-Interest Transactions [Line Items]    
Purchases made by the plan 229,346,719  
Sales made by the plan 300,580,581  
Dividends received on common stock 55,145,704  
Dividends and other receivables 17,031,156 38,400,064
Investments Issued by affiliates held $ 1,327,806,802 $ 1,331,364,750