Name:	pcar_BasisOfPresentationLineItems
Namespace Prefix:	pcar_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Cost of equipment in sales-type lease.

No definition available.

Name:	pcar_CostOfEquipmentInSalesTypeLease
Namespace Prefix:	pcar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Proceeds from collection of finance and sales type lease receivables.

No definition available.

Name:	pcar_ProceedsFromCollectionOfFinanceAndSalesTypeLeaseReceivables
Namespace Prefix:	pcar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Sales-type finance leases and dealer direct loans reclassified to income taxes, warranty and other.

No definition available.

Name:	pcar_SalesTypeFinanceLeasesAndDealerDirectLoansReclassifiedToIncomeTaxesWarrantyAndOther
Namespace Prefix:	pcar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Sales-type finance leases and dealer direct loans reclassified to trade and other receivable.

No definition available.

Name:	pcar_SalesTypeFinanceLeasesAndDealerDirectLoansReclassifiedToTradeAndOtherReceivable
Namespace Prefix:	pcar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84165051&loc=d3e45377-112738

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534