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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Non-recurring settlement charge, pre-tax | $ 600.0
Non-recurring settlement charge, after-tax | $ 446.4

X
- Definition Litigation settlement expense after tax. + References No definition available. + Details
Name: | pcar_LitigationSettlementExpenseAfterTax
Namespace Prefix: | pcar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration