Schedule of Assets - Schedule of Assets Held at End of Year (Details) - EBP 002
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12 Months Ended |
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Dec. 31, 2025
USD ($)
shares
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Plan Name |
Savings Investment Plan
|
| Entity Tax Identification Number |
91-0351110
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| EBP, Plan Number |
002
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| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 2,975,548,042
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| Participant loans |
$ 65,128,740
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| Investment, Identifier [Axis]: Commingled Trust Funds, BlackRock, International |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Commingled Trust Funds
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
International [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| Employee Benefit Plan, Investment, number of shares / units | shares |
397,720
|
| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 9,571,173
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| Investment, Identifier [Axis]: Commingled Trust Funds, Fidelity Management Trust Company, Contrafund Pool Class D |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Commingled Trust Funds
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Contrafund Pool Class D [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| Employee Benefit Plan, Investment, number of shares / units | shares |
7,486,562
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| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 417,151,227
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| Investment, Identifier [Axis]: Commingled Trust Funds, Fidelity Management Trust Company, Managed Income Portfolio II Class 3 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Commingled Trust Funds
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Managed Income Portfolio II Class 3 [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| Employee Benefit Plan, Investment, number of shares / units | shares |
127,265,556
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| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 127,265,556
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| Investment, Identifier [Axis]: Commingled Trust Funds, Northern Trust Funds, Aggregate Bond Index Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Commingled Trust Funds
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Aggregate Bond Index Fund [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Employee Benefit Plan, Investment, number of shares / units | shares |
159,705
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| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 21,456,322
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| Investment, Identifier [Axis]: Commingled Trust Funds, Northern Trust Funds, Collective Russell 2000 Index |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Commingled Trust Funds
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Collective Russell 2000 Index [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| Employee Benefit Plan, Investment, number of shares / units | shares |
57,665
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| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 23,929,618
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| Investment, Identifier [Axis]: Commingled Trust Funds, Northern Trust Funds, EAFE Index Fund Tier 3 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Commingled Trust Funds
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
EAFE Index Fund Tier 3 [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| Employee Benefit Plan, Investment, number of shares / units | shares |
196,768
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| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 40,148,567
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| Investment, Identifier [Axis]: Commingled Trust Funds, Northern Trust Funds, S&P 500 Index Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Commingled Trust Funds
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
S&P 500 Index Fund [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| Employee Benefit Plan, Investment, number of shares / units | shares |
417,858
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| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 288,936,587
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| Investment, Identifier [Axis]: Money Market Fund, Fidelity Management Trust Company, Fidelity Government Money Market |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Money Market Funds [Member]
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity Government Money Market [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| Employee Benefit Plan, Investment, number of shares / units | shares |
143,004
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| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 143,004
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| Investment, Identifier [Axis]: Mutual funds, Fidelity Management Trust Company, Freedom Index 2010 Fund |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Funds
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Freedom Index 2010 Fund [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| Employee Benefit Plan, Investment, number of shares / units | shares |
439,785
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| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 5,941,491
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| Investment, Identifier [Axis]: Mutual funds, Fidelity Management Trust Company, Freedom Index 2020 Fund |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Funds
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Freedom Index 2020 Fund [Member]
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| Employee Benefit Plan, Investment, number of shares / units | shares |
2,667,339
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| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 44,971,332
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| Investment, Identifier [Axis]: Mutual funds, Fidelity Management Trust Company, Freedom Index 2030 Fund |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Funds
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Freedom Index 2030 Fund [Member]
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Employee Benefit Plan, Investment, number of shares / units | shares |
8,264,440
|
| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 186,858,992
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| Investment, Identifier [Axis]: Mutual funds, Fidelity Management Trust Company, Freedom Index 2040 Fund |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Funds
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Freedom Index 2040 Fund [Member]
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Employee Benefit Plan, Investment, number of shares / units | shares |
6,189,895
|
| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 178,454,667
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| Investment, Identifier [Axis]: Mutual funds, Fidelity Management Trust Company, Freedom Index 2050 Fund |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Funds
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Freedom Index 2050 Fund [Member]
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Employee Benefit Plan, Investment, number of shares / units | shares |
4,302,782
|
| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 132,998,994
|
| Investment, Identifier [Axis]: Mutual funds, Fidelity Management Trust Company, Freedom Index 2060 Fund |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Funds
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Freedom Index 2060 Fund [Member]
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Employee Benefit Plan, Investment, number of shares / units | shares |
3,303,348
|
| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 71,253,225
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| Investment, Identifier [Axis]: Mutual funds, Fidelity Management Trust Company, Freedom Index 2070 Fund |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Funds
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Freedom Index 2070 Fund [Member]
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Employee Benefit Plan, Investment, number of shares / units | shares |
105,211
|
| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 1,298,310
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| Investment, Identifier [Axis]: Mutual funds, Fidelity Management Trust Company, Freedom Index Retirement Fund |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Funds
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Freedom Index Income Fund [Member]
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Employee Benefit Plan, Investment, number of shares / units | shares |
665,514
|
| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 8,219,095
|
| Investment, Identifier [Axis]: Mutual funds, JP Morgan Mid Cap Value Fund, Institutional Class |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Funds
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Institutional Class [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Employee Benefit Plan, Investment, number of shares / units | shares |
1,821,258
|
| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 58,118,174
|
| Investment, Identifier [Axis]: Mutual funds, PIMCO Total Return Fund, Institutional Class |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Funds
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Institutional Class [Member]
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Employee Benefit Plan, Investment, number of shares / units | shares |
3,501,682
|
| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 31,024,906
|
| Investment, Identifier [Axis]: PACCAR Inc Common Stock |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
EBP, Employer, Common Stock [Member]
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
PACCAR Inc Common Stock [Member]
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
| Employee Benefit Plan, Investment, number of shares / units | shares |
12,124,816
|
| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 1,327,806,802
|
| Minimum |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Employee benefit plan, asset held for investment, participant loan, interest rate |
4.25%
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| Maximum |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Employee benefit plan, asset held for investment, participant loan, maturity year |
2040
|
| Employee benefit plan, asset held for investment, participant loan, interest rate |
9.50%
|
| Commingled Trust Funds |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 928,459,050
|
| Mutual Funds |
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
| Employee benefit plan, asset held for investment, excluding plan interest in master trust, current value |
$ 719,139,186
|