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Estimated Value of Returned Goods Assets and Related Return Liabilities (Detail) - Truck, Parts and Other - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Trucks |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Other current assets | $ 109.9 | $ 116.7
Accounts payable, accrued expenses and other | 114.5 | 121.7
Other noncurrent assets, net | 143.6 | 135.9
Other liabilities | 150.8 | 144.7
Assets | 253.5 | 252.6
Liabilities | 265.3 | 266.4
Parts Subsegment |  |
Entity Wide Information Revenue From External Customer [Line Items] |  |
Other current assets | 100.8 | 101.7
Accounts payable, accrued expenses and other | 240.3 | 244.4
Assets | 100.8 | 101.7
Liabilities | $ 240.3 | $ 244.4

X
- Definition Estimated value of returned goods assets. + References No definition available. + Details
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Namespace Prefix: | pcar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Estimated value of returned goods liabilities. + References No definition available. + Details
Name: | pcar_EstimatedValueOfReturnedGoodsLiabilities
Namespace Prefix: | pcar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Estimated value of returned goods other current assets. + References No definition available. + Details
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Namespace Prefix: | pcar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Estimated value of returned goods other noncurrent assets, net. + References No definition available. + Details
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Namespace Prefix: | pcar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Estimated value of returned goods related to accounts payable, accrued expenses and other. + References No definition available. + Details
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Namespace Prefix: | pcar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Estimated value of returned goods related to other liabilities. + References No definition available. + Details
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Namespace Prefix: | pcar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |