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Disclosure - Transactions with PACCAR and Affiliates link:presentationLink link:calculationLink link:definitionLink 995485 - Disclosure - Stockholder's Equity link:presentationLink link:calculationLink link:definitionLink 995495 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 995505 - Disclosure - Derivative Financial Instruments link:presentationLink link:calculationLink link:definitionLink 995515 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 995525 - Disclosure - Segment and Related Information link:presentationLink link:calculationLink link:definitionLink 995535 - Disclosure - Basis of Presentation (Policies) link:presentationLink link:calculationLink link:definitionLink 995545 - Disclosure - Finance and Other Receivables (Tables) link:presentationLink link:calculationLink link:definitionLink 995555 - Disclosure - Transactions with PACCAR and Affiliates (Tables) link:presentationLink link:calculationLink link:definitionLink 995565 - Disclosure - Stockholder's Equity (Tables) link:presentationLink link:calculationLink link:definitionLink 995575 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 995585 - Disclosure - Derivative Financial Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 995595 - Disclosure - Basis of Presentation (Detail) link:presentationLink link:calculationLink link:definitionLink 995605 - Disclosure - Finance and Other Receivables (Detail) link:presentationLink link:calculationLink link:definitionLink 995615 - Disclosure - Finance and Other Receivables - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995625 - Disclosure - Allowance for Credit Losses (Detail) link:presentationLink link:calculationLink link:definitionLink 995635 - Disclosure - Finance Receivables within Credit Quality Indicator and Portfolio Class (Detail) link:presentationLink link:calculationLink link:definitionLink 995645 - Disclosure - Finance Receivables within Credit Quality Indicator and Portfolio Class (Detail) 2 link:presentationLink link:calculationLink link:definitionLink 995655 - Disclosure - Summary of Amortized Cost Basis of Financing Receivables by Aging Category (Detail) link:presentationLink link:calculationLink link:definitionLink 995665 - Disclosure - Amortized Cost Basis for Finance Receivables that are on Non-accrual Status (Detail) link:presentationLink link:calculationLink link:definitionLink 995675 - Disclosure - Interest Income Recognized on Cash Basis for Finance Receivables that are on Non-accrual Status (Detail) link:presentationLink link:calculationLink link:definitionLink 995685 - Disclosure - Amortized Cost Basis of Finance Receivables for Other Than Insignificant Term Extensions and Payment Delays for Customers in Financial Difficulty (Detail) link:presentationLink link:calculationLink link:definitionLink 995695 - Disclosure - Summary of Ending Amortized Cost Basis and Performance Financing Receivables Modified Previous Twelve Months (Details) link:presentationLink link:calculationLink link:definitionLink 995705 - Disclosure - Transactions with PACCAR and Affiliates - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995715 - Disclosure - Amounts Outstanding Including Foreign Finance Affiliates (Detail) link:presentationLink link:calculationLink link:definitionLink 995725 - Disclosure - Amounts Outstanding Including Foreign Finance Affiliates (Detail) 2 link:presentationLink link:calculationLink link:definitionLink 995735 - Disclosure - Amounts Outstanding Including Foreign Finance Affiliates (Detail) 3 link:presentationLink link:calculationLink link:definitionLink 995745 - Disclosure - Stockholder's Equity - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995755 - Disclosure - Components of Comprehensive Income (Detail) link:presentationLink link:calculationLink link:definitionLink 995765 - Disclosure - Changes in and Reclassifications out of Accumulated Other Comprehensive Loss (Detail) link:presentationLink link:calculationLink link:definitionLink 995775 - Disclosure - Assets and Liabilities Fair Value Measurements (Detail) link:presentationLink link:calculationLink link:definitionLink 995785 - Disclosure - Assets and Liabilities Fair Value Measurements (Parenthetical) (Details) link:presentationLink link:calculationLink link:definitionLink 995795 - Disclosure - Fair Value Measurements - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995805 - Disclosure - Carrying Amount and Fair Value for Fixed-Rate Loans and Debt (Detail) link:presentationLink link:calculationLink link:definitionLink 995815 - Disclosure - Derivative Financial Instruments - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995825 - Disclosure - Balance Sheet Classification, Fair Value and Gross and Net Amounts of Derivative Financial Instruments (Detail) link:presentationLink link:calculationLink link:definitionLink 995825 - Disclosure - Balance Sheet Classification, Fair Value and Gross and Net Amounts of Derivative Financial Instruments (Detail) [Default] link:presentationLink link:calculationLink link:definitionLink 995835 - Disclosure - Amounts Recorded on Balance Sheets Related to Cumulative Basis Adjustments for Fair Value Hedges (Detail) link:presentationLink link:calculationLink link:definitionLink 995845 - Disclosure - Amount of Expense (Income) on Cash Flow and Fair Value Hedges Recognized in Interest and Other Borrowing Costs on Statements of Comprehensive Income and Retained Earnings (Detail) link:presentationLink link:calculationLink link:definitionLink 995855 - Disclosure - Income Taxes - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 995865 - Disclosure - Segment and Related Information - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink Schedule Of Related Party Transactions By Related Party [Table] Related Party Transaction [Table] Current Fiscal Year Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff Balance Sheet Classification, Fair Value and Gross and Net Amounts of Derivative Financial Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Amortized Cost Basis Financing Receivable, Modified in Period, Amount Fixed rate debt Long-Term Debt, Percentage Bearing Fixed Interest, Amount Assets, Total [Member] Total Portfolio Assets Accounts Payable, Total Accounts Payable Payables Preferred stock, shares issued Preferred Stock, Shares Issued Tax-related payable due to PACCAR Tax Related Payable Due To Related Parties Amount of tax related payable due to related parties. Amortized Cost Basis for Finance Receivables that are on Non-accrual Status Financing Receivable, Nonaccrual [Table Text Block] Dividends, Cash Dividends, Cash, Total Dividends paid Other Receivables, Net, Current Due from PACCAR and affiliates Minimum Minimum [Member] Loans to foreign affiliates, upper limit Related Party Transaction Maximum Expected Amounts Due From To Related Party The maximum amount of loans to a foreign entity that is affiliated with the reporting entity by means of direct or indirect ownership. Preferred Stock, Shares Outstanding, Ending Balance Preferred Stock, Shares Outstanding, Beginning Balance Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Fair Value, Recurring [Member] Fair Value, Assets and Liabilities Measured on Recurring Basis Loans and Leases Loans And Leases [Member] Loans and leases. Common stock, shares issued Common Stock, Shares, Issued Repayments of Medium-Term Note Payments of medium-term notes Income Tax Expense (Benefit), Total Income tax effect Income taxes Income Tax Expense (Benefit) Proceeds from (Repayments of) Commercial Paper, Total Proceeds from (Repayments of) Commercial Paper Net decrease in short-term commercial paper Depreciation and other rental expenses Depreciation On Equipment On Operating Leases And Other Vehicle Related Expense The total amount of depreciation charge recorded for property subject to or held for lease and other rental expenses. Related Party Transaction [Line Items] Related Party Transaction [Line Items] Receivable Type Receivable Type [Axis] Cost of used truck sales and other expenses Cost of Goods and Services Sold, Total Cost of Product and Service Sold Other, net Payment for (Proceeds from) Other Investing Activity Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery, Total Charge-offs, net of recoveries Non-Rule 10B5-1 Arr Modified Flag Non-Rule 10B5-1 Arr modified flag. Non-Rule 10b5-1 Arrangement Modified Income Statement [Abstract] Loan Restructuring Modification Loan Restructuring Modification [Axis] Dealer wholesale financing Loans Receivable Wholesale Financing Loans The net investment in the financing of new and used vehicles held in dealer inventory that are available for sale. New Accounting Pronouncements Or Change In Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Amounts reclassified out of AOCI Reclassification out of Accumulated Other Comprehensive Income [Member] Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Axis] Related Party Related and Nonrelated Parties [Domain] Document Period End Date Document Period End Date Common stock, shares authorized Common Stock, Shares Authorized Statement of Stockholders' Equity [Abstract] Total Financing receivables, past due Financing Receivable, before Allowance for Credit Loss, Ending Balance Financing Receivable, before Allowance for Credit Loss, Beginning Balance Loans due Loans due from PACCAR/ foreign affiliates Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Domain] Increase Decrease In Wholesale Receivables The net change during the reporting period in amounts due to the reporting entity for Dealer Wholesale Receivables. Net decrease in wholesale receivables Interest Rate Contract Interest Rate Contract [Member] Accounting Standards Update 2025-05 [Member] ASU 2025-05 Dealer Dealer [Member] Dealer. TOTAL EXPENSES Costs and Expenses Components of Comprehensive Income Comprehensive Income (Loss) [Table Text Block] TOTAL ASSETS Assets Title of 12(b) Security Title of Each Class Preferred stock, par value $100 per share, 6% noncumulative and nonvoting, 450,000 shares authorized, 310,000 shares issued and outstanding Preferred Stock, Value, Issued Related Party Transaction [Axis] Notional Amount Of Interest Rate Derivatives Maturing In Remainder Of Fiscal Year Notional maturities for all interest-rate contracts for the remainder of the fiscal year. Notional maturities for interest-rate contracts, remainder of 2026 Property, Plant, and Equipment, Lessor Asset under Operating Lease, after Accumulated Depreciation, Total Property, Plant, and Equipment, Lessor Asset under Operating Lease, after Accumulated Depreciation Equipment on operating leases, net of accumulated depreciation (2026 - $253.0 and 2025 - $261.5) Liabilities: Liabilities, Fair Value Disclosure [Abstract] Effective Income Tax Rate Reconciliation, Percent, Total Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Notional Amount Of Interest Rate Derivatives Maturing In Year Three Notional maturities for all interest-rate contracts during fiscal year three. Notional maturities for interest-rate contracts 2028 Equipment on operating leases, accumulated depreciation Property, Plant, and Equipment, Lessor Asset under Operating Lease, Accumulated Depreciation Location, Statement of Financial Position, Balance [Axis] Retail loans Loans Receivable The net investment in fixed or floating interest-rate loans to customers. Accounts Payable and Accrued Liabilities [Abstract] Rule 10b5-1 Arr Modified Flag Rule 10b5-1 Arr Modified Flag Rule 10b5-1 Arrangement Modified Cash Cash Ending balance Equity, Attributable to Parent TOTAL STOCKHOLDER'S EQUITY Beginning balance Financing Receivable, Modified [Line Items] Income Taxes Income Tax Disclosure [Text Block] Carrying Amount and Fair Value Fixed-Rate Loans and Fixed-Rate Debt Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value Estimate of Fair Value Measurement [Member] Number of Reportable Segments Number of reportable segment Derivative Instruments, Gain (Loss) [Table] Assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Proceeds from sales of repossessed assets Proceeds from Sale of Foreclosed Assets Financial Asset, Aging Financial Asset, Aging [Domain] Statistical Measurement Statistical Measurement [Axis] Acquisitions of equipment for operating leases Payments to Acquire Equipment on Lease Entity Interactive Data Current Entity Interactive Data Current Long-Lived Asset, Held-for-Sale, Fair Value Disclosure Used trucks held for sale Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Wholesale Wholesale [Member] Wholesale. Foreign Finance Affiliates Foreign Affiliated [Member] Foreign affiliated. Foreign Finance Affiliates Common Stock, Value, Issued Common stock, par value $100 per share, 200,000 shares authorized, 145,000 shares issued and outstanding Proceeds from Sale of Property, Plant, and Equipment, Total Proceeds from disposals of equipment Proceeds from Sale of Property, Plant, and Equipment TOTAL LIABILITIES Liabilities Dealer master notes Dealer Master Notes The net investment in dealer master notes. Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Total Retained earnings RETAINED EARNINGS AT BEGINNING OF PERIOD RETAINED EARNINGS AT END OF PERIOD Other Liability, Related Party [Extensible Enumeration] Performing Pass [Member] Derivative Asset, Notional Amount Notional amount of outstanding contracts Finance and other receivables originated Payments to Acquire Finance Receivables Hedging Relationship [Domain] Fair Value By Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Gross Charge-Offs Gross Charge Offs [Member] Gross charge-offs. Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Fiscal Year before Current Fiscal Year Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Pro forma net amount Derivative Liability Related Party Transactions [Abstract] Retail Retail [Member] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Long-Lived Tangible Asset Long-Lived Asset, Class [Axis] Financing Receivable, Year One, Originated, Current Fiscal Year 2026 Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Extended Maturity Extended Maturity [Member] Assets: Assets, Fair Value Disclosure [Abstract] Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Two Years before Current Fiscal Year Loans And Other Receivables Net Loans and other receivables net. Finance and other receivables, net Finance and other receivables, net of allowance for losses (2026 - $82.1 and 2025 - $83.8) Concentration Risk Type Concentration Risk Type [Domain] Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff Prior Derivative [Line Items] Derivative [Line Items] Watch Special Mention [Member] Liabilities and Equity TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY Commercial paper Commercial Paper Document Fiscal Period Focus Document Fiscal Period Focus Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Net Investment in Lease, before Allowance for Credit Loss, Total Retail financing leases Net Investment in Lease, before Allowance for Credit Loss Number of portfolio segments Number Of Portfolio Segments Number of portfolio segments. A portfolio segment is the level at which an entity develops and documents a systematic method for determining its allowance for credit losses. Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Subsegments Subsegments [Domain] Operating Lease, Lease Income, Total Operating lease and rental revenues Operating Lease, Lease Income Prior Financing Receivable, Originated, More than Five Years before Current Fiscal Year Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation NET DECREASE IN CASH Entity Current Reporting Status Entity Current Reporting Status Owner Operator [Member] Owner/operator. Owner/Operator Contractual term of regular payment of principal and interest Receivable Collection Period Finance receivable collection period. Schedule Of Financing Receivable Recorded Investment Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Document Transition Report Document Transition Report Accounting Standards Update Accounting Standards Update [Domain] Total portfolio Loans And Other Receivables Gross Loans and other receivables gross. Financing Receivable, Modified, Previous Twelve Months [Table Text Block] Financing receivable, modified, previous twelve months. Summary of Ending Amortized Cost Basis and Performance Financing Receivables Modified Previous Twelve Months Operating lease receivables and other Operating Lease Receivables And Other Operating lease receivables and other. Financing lease, interest income Sales-type and Direct Financing Leases, Interest Income Common Stock Common Stock [Member] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Accounting Standards Update Accounting Standards Update [Axis] Statistical Measurement Statistical Measurement [Domain] Medium-term Notes, Total Medium-term notes Medium-Term Note STOCKHOLDER'S EQUITY Equity, Attributable to Parent [Abstract] ASSETS Assets [Abstract] Loan Restructuring Modification Loan Restructuring Modification [Domain] Entity Central Index Key Entity Central Index Key Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Current Fiscal Year End Date Current Fiscal Year End Date Derivative [Table] Derivative [Table] Document Quarterly Report Document Quarterly Report Number of facilities leased by company Number Of Facilities Leased By Company Number of facilities leased by company. Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage Annualized % of total retail portfolio Total (income) and expense Income Loss Impact On Fair Value Hedges And Matured Cash Flow Hedges On Statement Of Income Income loss impact on fair value hedges and matured cash flow hedges on statement of income. Total (income) and expense Fair Value, Inputs, Level 2 Fair Value, Inputs, Level 2 [Member] Level 2 Proceeds from Sale and Collection of Finance Receivables, Total Collections on finance and other receivables Proceeds from Sale and Collection of Finance Receivables NET CASH PROVIDED BY OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Accumulated net gain on interest rate contracts included in AOCI expected to be reclassified to interest expense in the following 12 months Accumulated net gain on interest rate contracts included in AOCI expected to be reclassified to interest expense in the following 12 months Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Cash Flow Hedging [Member] Cash Flow Hedging Net income NET INCOME 31 - 60 days past due Financial Asset, 30 to 59 Days Past Due [Member] Long-Lived Tangible Asset Long-Lived Asset, Class [Domain] Amortized cost basis with a specific reserve Financing Receivable Nonaccrual With Allowance Financing receivable nonaccrual with allowance. Net other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Net other comprehensive income (loss) Amounts Recorded on Balance Sheets Related to Cumulative Basis Adjustments for Fair Value Hedges Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Total Financing Receivable, Nonaccrual Total comprehensive income COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Attributable to Parent Measurement Frequency Measurement Frequency [Domain] Equity Components Equity Components [Axis] INVESTING ACTIVITIES Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Statement of Cash Flows [Abstract] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Income Tax Disclosure [Abstract] Financing Receivable, Modified, Subsequent Default Finance receivables modified with customers Trucks Inventory Trucks [Member] Assets and Liabilities Fair Value Measurements Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Other All Other [Member] All other. Loans to PACCAR and affiliates Origination of Notes Receivable from Related Parties Effect on the allowance for credit losses Less allowance for credit losses Finance and other receivables, allowance for losses Beginning Balance Ending Balance Financing Receivable, Allowance for Credit Loss Interest-rate contracts maturity period Derivative, Remaining Maturity Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 2025 Preferred stock, shares authorized Preferred Stock, Shares Authorized Derivative Contract Derivative Contract [Domain] Accumulated Gain (Loss) Net Cash Flow Hedge Parent Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Derivative Instruments, Gain (Loss) [Table Text Block] Amount of Expense (Income) on Cash Flow and Fair Value Hedges Recognized in Interest and Other Borrowing Costs on Statements of Comprehensive Income and Retained Earnings Accumulated Other Comprehensive Income AOCI Attributable to Parent [Member] ASU 2025-09 Accounting Standards Update 2025-09 [Member] Customers Experiencing Financial Difficulty Customers Experiencing Financial Difficulty [Member] Customers experiencing financial difficulty. Receivable Receivable [Domain] Liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Other Comprehensive Income (Loss) before Reclassifications, Tax, Total Other Comprehensive Income (Loss) before Reclassifications, Tax Amounts recorded in AOCL related to Unrealized gain (loss) on derivative contracts, income tax effect Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income (loss) Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Interest and other borrowing costs Interest And Other Borrowing Costs Amount of the cost of borrowed funds accounted for as interest expense and other borrowing costs. Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 2022 Document Type Document Type Accounts, Notes, Loans and Financing Receivable, Unclassified [Abstract] Due from PACCAR and affiliates Charge-offs Financing Receivable, Allowance for Credit Loss, Writeoff Total OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Allowance for Credit Losses Financing Receivable, Allowance for Credit Loss [Table Text Block] Internal Credit Assessment Internal Credit Assessment [Axis] Recoveries Financing Receivable, Allowance for Credit Loss, Recovery Loans Receivable Loans Receivable [Member] Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 2024 Entity File Number Securities Act File Number Provision for Loan, Lease, and Other Losses, Total Provision for losses on receivables Provision for Loan, Lease, and Other Losses Provision for losses Administrative fees for services from PACCAR Increase (Decrease) in Due to Affiliates Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] Immaterial effect Financing Receivable, Modified, after 12 Months Financing Receivables Modified Previous Twelve Months Finance receivables modified Carrying amount of the hedged liabilities Derivative, Amount of Hedged Item Retained Earnings Retained Earnings [Member] Entity Registrant Name Entity Registrant Name Accounting Policies [Abstract] At-risk Substandard [Member] Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Selling, General and Administrative Expense, Total Selling, general and administrative expenses Selling, General and Administrative Expense Entity Address, Address Line One Entity Address, Address Line One Fixed Charge Coverage Ratio Minimum Fixed charge coverage ratio, minimum. Required ratio of net earnings available for fixed charges to fixed charges Due from PACCAR and affiliates Loans due from foreign finance affiliates Operating lease receivables and other Reclassified from AOCI into income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Reclassified from AOCI into income Revolving Loans Financing Receivable, Revolving Other Receivable, after Allowance for Credit Loss, Related Party [Extensible Enumeration] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Segments Segments [Axis] Derivatives, Policy [Policy Text Block] Derivative Financial Instruments Transactions with PACCAR and Affiliates Related Party Transactions Disclosure [Text Block] Finance and Other Receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Deferred Income Tax Expense (Benefit), Total Deferred taxes Deferred Income Tax Expense (Benefit) Entity Small Business Entity Small Business Credit Concentration Risk Credit Concentration Risk [Member] Notional Amount Of Interest Rate Derivatives Maturing In Year Five Notional maturities for all interest-rate contracts during fiscal year five. Notional maturities for interest-rate contracts 2030 Long-Term Debt, Type Long-Term Debt, Type [Axis] Preferred stock dividend percentage Preferred Stock, Dividend Rate, Percentage Other Assets, Total Other assets Other Assets Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Pro forma net amount Derivative Asset Financing receivable modifications weighted average term extension. Financing Receivable Modifications Weighted Average Term Extension Financing receivable modifications weighted average term extension Finance Receivables by Credit Quality Indicator and Portfolio Class Financing Receivable Credit Quality Indicators [Table Text Block] Equity [Abstract] ASU 2025-10 Accounting Standards Update 202510 [Member] Accounting Standards Update 2025-10. Fleet Fleet [Member] Fleet. Stockholder's Equity Equity [Text Block] Measurement Frequency Measurement Frequency [Axis] Interest and Fee Income, Loans and Leases, Total Interest and fee income Interest and Fee Income, Financing Receivable FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Repossessed inventory Other Repossessed Assets Financing Receivable Financing Receivable [Member] Summary of Amortized Cost Basis of Financing Receivables by Aging Category Financing Receivable, Past Due [Table Text Block] LIABILITIES Liabilities [Abstract] Entity Tax Identification Number Entity Tax Identification Number Derivative Instrument Derivative Instrument [Axis] Equity Component Equity Component [Domain] Entity Address, City or Town Entity Address, City or Town Segments Segments [Domain] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Concentration Risk Type Concentration Risk Type [Axis] Medium-term Notes Medium-Term Note [Member] Current and up to 30 days past due Financing Receivables Current And Up To30 Days Past Due [Member] Financing receivables current and up to 30 days past due. Segment Reporting, Expense Information Used by CODM, Description Customers in financial difficulty Financing Receivable, Modified, Accumulated Fair Value Measurement Basis [Axis] Derivative contracts Assets gross amount recognized in balance sheets Interest rate derivative portfolio Investments from PACCAR Adjustments To Additional Paid In Capital Investments From Related Party Adjustments to Additional Paid in Capital, Investments from Related Party Statement [Table] Statement [Table] INCOME BEFORE INCOME TAXES Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Less amounts not offset in financial instruments Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Affiliated Entity [Member] Foreign Finance Affiliates Fixed rate loans Loans Receivable with Fixed Rates of Interest Entity Shell Company Entity Shell Company Cash Provided by (Used in) Investing Activity, Including Discontinued Operation NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES Statement [Line Items] Statement [Line Items] Accounts Payable and Accrued Liabilities, Total Accounts payable, accrued expenses and other Accounts Payable and Accrued Liabilities Deferred taxes and other liabilities Deferred Tax Liabilities And Other Liabilities Sum of the amount of deferred tax liabilities net of deferred tax assets and the aggregate carrying amount of liabilities not separately disclosed in the balance sheet. Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Maximum Maximum [Member] Proceeds from Issuance of Medium-Term Note Proceeds from medium-term notes Increase (Decrease) in Other Operating Liabilities, Total Increase (Decrease) in Other Operating Liabilities Increase in payables (Decrease) increase in payables and other and other Increase (decrease) in payables and other Finance and Other Receivables Financing Receivables [Text Block] Receivables more than 90 days past due still accruing Financing Receivable, 90 Days or More Past Due, Still Accruing Other Affiliates [Member] Notional Amount Of Interest Rate Derivatives Maturing In Year Two Notional maturities for all interest-rate contracts during fiscal year two. Notional maturities for interest-rate contracts 2027 Concentration Risk Benchmark Concentration Risk Benchmark [Axis] Increase Decrease In Loan And Leases To Affiliates The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances, to an entity that is affiliated with the reporting entity by means of direct or indirect ownership, that are not originated or purchased specifically for resale. Net decrease in other receivables to PACCAR and affiliates New Accounting Pronouncement Or Change In Accounting Principle Effective Date New accounting pronouncement or change in accounting principle effective date. Effective date Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financing Receivable Portfolio Segment Financing Receivable Portfolio Segment [Axis] Related Party Transaction [Domain] Other Comprehensive Income (Loss), before Reclassifications, before Tax Amounts recorded in AOCL related to Unrealized gain (loss) on derivative contracts, before tax Loans Receivable, Fair Value Disclosure Impaired loans, net of specific reserves PACCAR and Affiliates Member PACCAR and Affiliates Member Document Fiscal Year Focus Document Fiscal Year Focus Change in tax-related balances with PACCAR Increase Decrease In Due To Due From Related Parties The increase (decrease) during the reporting period in receivables to be collected from or paid to other entities that could exert significant influence over the reporting entity. Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common stock, shares outstanding Common Stock, Shares, Outstanding Accounting Standards Update 2025-06 [Member] ASU 2025-06 Statement of Comprehensive Income [Abstract] Used truck impairments Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down Related Party [Member] Related Party Adopted Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Ownership percentage of PACCAR Percentage Of Ownership Interests Percentage of ownership interests. Security Exchange Name Name of Each Exchange on Which Registered Less amounts not offset in financial instruments Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Financing Receivable, Nonaccrual, Interest Income Interest income recognized on cash basis for finance receivables that are on non-accrual status TOTAL INTEREST AND OTHER REVENUES Revenues Impaired Financing Receivable, Related Allowance Impaired loans, specific reserves Related Party Related and Nonrelated Parties [Axis] New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements: Derivative, Gain (Loss) on Derivative, Net, Total Derivatives Derivative, Gain (Loss) on Derivative, Net Derivatives Entity Address, State or Province Entity Address, State or Province Accounts Receivable, after Allowance for Credit Loss, Total Accounts Receivable, after Allowance for Credit Loss Receivables Amendment Flag Amendment Flag Financial Asset, Aging Financial Asset, Aging [Axis] Percentage of customers diversification in portfolio Concentration Risk, Percentage Preferred stock, noncumulative and nonvoting Preferred Stock Noncumulative And Nonvoting Percentage of noncumulative, nonvoting preferred stock redeemable solely at the option of the issuer. Schedule Of Financing Receivables Past Due [Table] Financing Receivable, Past Due [Table] Financing Receivable Portfolio Segment Financing Receivable Portfolio Segment [Domain] Impaired Loans Reserves Impaired loans reserves. Impaired loans, specific reserves City Area Code City Area Code Amortized cost basis with no specific reserve Financing Receivable, Nonaccrual, No Allowance Internal Credit Assessment [Domain] Internal Credit Assessment Collections on loans from PACCAR and affiliates Repayment of Notes Receivable from Related Parties Number Of Large Customers Number Of Large Customers Number of large customers Preferred Stock Preferred Stock [Member] Carrying Amount Reported Value Measurement [Member] Schedule Of Accounts Notes Loans And Financing Receivable [Table] Accounts and Financing Receivables [Table] Maximum length of time for which company is hedging its exposure to the variability in future cash flows Cash Flow Hedge, Hedging Exposure, Maximum Period Financing Receivable Recorded Investment [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Hedging Relationship [Axis] Notional maturities for interest-rate contracts thereafter Notional Amount Of Interest Rate Derivatives Maturing In After Year Five Notional amount of interest rate derivatives maturing in after year five. Other Liabilities Due to PACCAR and affiliates Due to PACCAR and affiliates Modifications extended contractual terms Financing Receivable Modifications Term Extension Financing receivable modifications term extension. Common stock, par value Common Stock, Par or Stated Value Per Share Financing Receivable, Modified [Table Text Block] Amortized Cost Basis of Finance Receivables for Other Than Insignificant Term Extensions and Payment Delays for Customers in Financial Difficulty Financial Services Financial Services [Member] Financial services. Financing Receivable [Policy Text Block] Finance Receivables Allowance for Credit Losses Depreciation, Amortization and Accretion, Net, Total Depreciation and amortization Depreciation, Amortization and Accretion, Net Greater than 60 days past due Financing Receivables Greater Than60 Days Past Due [Member] Financing receivables, greater than 60 days past due. Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total CASH AT BEGINNING OF PERIOD CASH AT END OF PERIOD Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Segment Reporting [Text Block] Segment and Related Information Derivative Instruments and Hedging Activities Disclosure [Abstract] Cumulative basis adjustments on discontinued hedge relationships Deferred (Gain) Loss on Discontinuation of Fair Value Hedge Trading Symbol Trading Symbol Fair Value Measurement, Policy [Policy Text Block] Fair Value Measurements Used truck sales and other revenues Revenue from Contract with Customer, Including Assessed Tax Entity Emerging Growth Company Entity Emerging Growth Company Subsegments Subsegments [Axis] Additional Paid-in Capital Additional Paid-in Capital [Member] Receivables [Abstract] Fair Value Measurement Fair Value Measurement [Domain] DESCRIPTION New Accounting Pronouncement or Change in Accounting Principle, Description Portion at Fair Value Measurement [Member] [Default] Fair Value Disclosure Item Amounts [Default] Portion at Fair Value Measurement [Member] Payments of Dividends, Total Dividends paid Payments of Dividends Notional Amount Of Interest Rate Derivatives Maturing In Year Four Notional maturities for all interest-rate contracts during fiscal year four. Notional maturities for interest-rate contracts 2029 Cover [Abstract] New Accounting Pronouncements Or Change In Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) Cumulative basis adjustment (decrease) increase included in the carrying amount Hedged items Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Hedged items Long-Term Debt, Type Long-Term Debt, Type [Domain] Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Additional Paid in Capital, Total Additional paid-in capital Additional Paid in Capital Items included in net income not affecting cash: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Changes in and Reclassifications out of Accumulated Other Comprehensive Loss Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule Of Financing Receivable Allowance For Credit Losses [Table] Financing Receivable, Allowance for Credit Loss [Table] Fair Value Disclosures [Abstract] Accumulated Other Comprehensive Income Loss [Table] Accumulated Other Comprehensive Income (Loss) [Table] Cash Provided by (Used in) Financing Activity, Including Discontinued Operation NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES Accounting Changes and Error Corrections [Abstract] Amounts Outstanding Including Foreign Finance Affiliates Schedule of Related Party Transactions [Table Text Block] Fair Value Measurements, Nonrecurring Fair Value, Nonrecurring [Member] Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Four Years before Current Fiscal Year Derivative Instruments, Gain (Loss) [Line Items] Entity Filer Category Entity Filer Category Interest Income Recognized on Cash Basis for Finance Receivables that are on Non-accrual Status Interest Income Recognized On Cash Basis For Finance Receivables That Are On Non Accrual Status Table [Text Block] Interest income recognized on cash basis for finance receivables that are on non-accrual status. Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff Three Years before Current Fiscal Year Customer Retail Customer Retail [Member] Customer retail. Financing Receivable, Modified [Table] Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Net unrealized gain (loss) Derivative contracts increase (decrease) Derivative contracts Liabilities gross amount recognized in balance sheets Derivative Liability, Subject to Master Netting Arrangement, before Offset Derivative Asset, Statement of Financial Position [Extensible Enumeration] Segment Reporting [Abstract] Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 2023 Entity Address, Postal Zip Code Entity Address, Postal Zip Code Statement of Financial Position [Abstract] Local Phone Number Local Phone Number