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v3.23.2

Segment Reporting Information by Segment (Parenthetical) (Detail) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2023 USD ($)
Segment Reporting [Abstract] |
Non recurring expenses related to litigation | $ 600

X
- Definition Non recurring expenses related to litigation. + References No definition available. + Details
Name: | pcar_NonRecurringExpensesRelatedToLitigation
Namespace Prefix: | pcar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration