Entity tax identification number Entity Tax Identification Number Participant Rollover EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum Maximum [Member] Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] NET INCREASE IN NET ASSETS AVAILABLE FOR BENEFITS EBP, Change in Net Asset Available for Benefit, Increase (Decrease) After Plan Merger EBP, Change in Net Asset Available for Benefit, Increase (Decrease) After Plan Merger Mutual funds Mutual Fund [Member] Benefit distributions payable EBP, Liability to Participant EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Maximum allowable elective contribution percentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Self-directed brokerage account EBP, Self-Directed Brokerage Account [Member] Notes receivable from participants, maximum borrowing EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Sick pay hours to convert to plan contributions EBP, Sick Pay Hours To Convert to Plan Contributions EBP, Sick Pay Hours To Convert to Plan Contributions FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Text Block] Notes receivable from participants, minimum borrowing EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount EBP, Nonparticipant-Directed Investment [Abstract] Net investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Investment Income (Loss), after Investment Expense Total investments Net Assets EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Level 1 - Unadjusted quoted prices in active markets for identical assets: Fair Value, Inputs, Level 1 [Member] Schedule of Reconciliation of Net Assets Available for Benefits and Increase in Net Assets Available for Benefits to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] EBP, Vesting [Axis] EBP, Vesting [Axis] EBP, Vesting EBP, Investment, Fair Value and NAV [Abstract] Excess Contribution Payable EBP, Excess Contribution Payable [Policy Text Block] Total assets EBP, Asset ASSETS: EBP, Asset [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Benefit Distribution EBP, Payment to Participant [Policy Text Block] Plan mergers Plan assets transferred to (from) the plan CPKC 401(k) Savings Plan & Canadian Pacific U.S. Salaried Retirement Income Plan merger (Note 1) EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan Total liabilities EBP, Liability Amendment Flag Amendment Flag EBP 002 EBP 002 [Member] EBP 002 Deduct: Deemed distribution of participant loans EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Deemed Distribution Basis of Accounting EBP, Basis of Accounting [Policy Text Block] NONPARTICIPANT-DIRECTED INVESTMENTS EBP, Nonparticipant-Directed Investment [Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Investment, number of shares (in shares) EBP, Investment, Number of Shares EBP, Nonparticipant-Directed Investment [Line Items] EBP, Nonparticipant-Directed Investment [Line Items] EBP, Description of Plan and Accounting Change [Abstract] Plan Investment Assets at Fair Value EBP, Investment, Fair Value and NAV [Table Text Block] Sick pay hours to convert to sick leave pay deposit to plan EBP, Maximum Sick Pay Hours to Convert to Sick Leave Pay Deposit to Plan EBP, Maximum Sick Pay Hours to Convert to Sick Leave Pay Deposit to Plan Participant directed EBP, Participant-Directed [Member] EBP, Contribution, Participating Employer [Domain] EBP, Contribution, Participating Employer [Domain] Investments [Domain] Investments [Domain] Use of Estimate EBP, Use of Estimate [Policy Text Block] Schedule H, Line 4i – Schedule of Assets (Held At End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] EBP, Contribution, Participating Employer [Axis] EBP, Contribution, Participating Employer [Axis] Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Three or more/Three but less than Four EBP, Vesting Tranche Four [Member] EBP, Vesting Tranche Four Investment, purchased, number of shares (in shares) EBP, Investment, Purchased, Number of Shares Four but less than Five EBP, Vesting Tranche Five [Member] EBP, Vesting Tranche Five Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Participant EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Forfeited account balances reduced employer contributions and administrative expenses EBP, Forfeited Nonvested Account, Decrease from Employer Contribution and Administrative Expense EBP, Forfeited Nonvested Account, Decrease from Employer Contribution and Administrative Expense Interest and dividends EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment Notes receivable from participants, maximum borrowing term EBP, Note Receivable From Participant, Maximum Borrowing Term EBP, Note Receivable From Participant, Maximum Borrowing Term EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Employees Eligible for Employer Nonelective Contributions Employees Eligible for Employer Nonelective Contributions [Member] Employees Eligible for Employer Nonelective Contributions Plan number EBP, Plan Number DM&E Union and CMQ U.S. Plan DM&E Union and CMQ US Plan [Member] DM&E Union and CMQ US Plan Other income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Other Investment Income (Loss) EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] SUMMARY DESCRIPTION OF THE PLAN EBP, Description of Plan [Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] Add: Prior year deemed distributions of participant loans EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Prior Period, Increase from Deemed Distribution EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Contributions EBP, Contribution [Policy Text Block] Common stock—Canadian Pacific Kansas City Limited stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Nonparticipant-Directed Investment [Table] EBP, Nonparticipant-Directed Investment [Table] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Schedule of Nonparticipant-Directed Investments EBP, Nonparticipant-Directed Investment [Table Text Block] INVESTMENT INCOME: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment, Identifier [Axis] Investment, Identifier [Axis] Total - Participant Directed Investments EBP, Asset Held for Investment Risks and Uncertainties EBP, Risk and Uncertainty [Policy Text Block] Document Information [Line Items] Document Information [Line Items] Changes in Net Assets: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract] Employer matching contribution, percentage of compensation EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] MidSouth Plan MidSouth Plan [Member] MidSouth Plan Investment, sold, number of shares (in shares) EBP, Investment, Sold, Number of Shares Investment, transferred into plan, number of shares (in shares) EBP, Investment, Number of Shares, TransferTo (From) Plan EBP, Investment, Number of Shares, TransferTo (From) Plan Deduct: Current year deemed distributions of participant loans EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Current Period, Decrease from Deemed Distribution Total net increase per the Form 5500 EBP, Form 5500 Caption, Net Income (Loss) EBP, Tax Status [Table] EBP, Tax Status [Table] NET INCREASE IN NET ASSETS BEFORE PLAN MERGER Transfers to participant directed investments Total net increase in net assets before plan merger per the financial statements EBP, Change in Net Asset Available for Benefit, Increase (Decrease) EXEMPT RELATED PARTY AND PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Text Block] Two but less than Three EBP, Vesting Tranche Three [Member] EBP, Vesting Tranche Three Less than One EBP, Vesting Tranche One [Member] EBP, Vesting Tranche One EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Employer contribution receivable EBP, Employer Contribution, Receivable Automatic deferral percentage EBP, Participant Contribution, Automatic, Deferral Rate Investments EBP, Investment, Fair Value [Abstract] Recorded dividend income EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Current value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Statement of Net Asset Available for Benefit [Abstract] Minimum allowed participant contribution percentage EBP, Participant Contribution, After Tax, Minimum Annual Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, After Tax, Minimum Annual Contribution to Eligible Compensation, Percentage EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Tax Status [Abstract] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] Other liabilities EBP, Other Liability EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] Eligibility age EBP, Eligibility Age EBP, Eligibility Age Invest-Related Expenses EBP, Expense [Policy Text Block] RECONCILIATION TO FORM 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] Notes receivable from Participants EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] One but less than Two EBP, Vesting Tranche Two [Member] EBP, Vesting Tranche Two Requisite service period EBP, Requisite Service Period EBP, Requisite Service Period Document Type Document Type Investment income before investment-related expenses EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Investment Income (Loss), before Investment Expense EBP, Vesting [Domain] EBP, Vesting [Domain] EBP, Vesting [Domain] Entity Central Index Key Entity Central Index Key Notes receivable from participants, interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Less: investment-related expenses EBP, Change in Net Asset Available for Benefit, Decrease from Investment Expense NET ASSETS AVAILABLE FOR BENEFITS: Net Assets EBP, Net Asset Available for Benefit [Abstract] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Subsequent Event [Table] EBP, Subsequent Event [Table] DEDUCTIONS: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Vested Percentage EBP, Employer Contribution Vesting Percentage EBP, Employer Contribution Vesting Percentage Five or more EBP, Vesting Tranche Six [Member] EBP, Vesting Tranche Six Notes receivable from participants EBP, Note Receivable from Participant Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name EBP, Subsequent Event [Abstract] LIABILITIES: EBP, Liability [Abstract] Participant withdrawal, maximum period for payment EBP, Participant Withdrawal, Maximum Period for Payment EBP, Participant Withdrawal, Maximum Period for Payment SUBSEQUENT EVENTS EBP, Subsequent Event [Text Block] INCOME TAX STATUS EBP, Tax Status [Text Block] Notes receivable from participants, maximum percentage of borrowing to vested account balance EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Subsequent Event [Line Items] EBP, Subsequent Event [Line Items] EBP, Participant-Directed and Nonparticipant-Directed Status [Domain] EBP, Participant-Directed and Nonparticipant-Directed Status [Domain] EBP, Participant-Directed and Nonparticipant-Directed Status [Axis] EBP, Participant-Directed and Nonparticipant-Directed Status [Axis] Document Information [Table] Document Information [Table] Participant compensation matched by employer EBP, Employer Contribution, Participant Compensation Matched EBP, Employer Contribution, Participant Compensation Matched Nonparticipant directed EBP, Nonparticipant-Directed [Member] Notes receivable from participants, interest rate spread over prime lending rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate Note Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] CMQ U.S. Non-Union and Union CMQ U.S. Non-Union and Union [Member] CMQ U.S. Non-Union and Union EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] NET ASSETS AVAILABLE FOR BENEFITS Beginning of year End of year NET ASSETS AVAILABLE FOR BENEFITS EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Non-Union Non-Union [Member] Non-Union CONTRIBUTIONS: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Other EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Other EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Other Vesting Schedule for Matching Contributions EBP, Schedule of Employer Contribution Vesting [Table Text Block] EBP, Schedule of Employer Contribution Vesting Forfeited account balances EBP, Forfeited Nonvested Account Employer matching contribution percentage EBP, Employer Contribution, Matching Percentage Maximum allowed participant contribution percentage EBP, Participant Contribution, After Tax, Maximum Annual Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, After Tax, Maximum Annual Contribution to Eligible Compensation, Percentage Net assets per the Form 5500 EBP, Form 5500 Caption, Net Assets Kansas City Southern Railway Company and SouthRail Corporation Kansas City Southern Railway Company and SouthRail Corporation [Member] Kansas City Southern Railway Company and SouthRail Corporation EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] PLAN MERGERS: EBP, Change in Net Asset Available for Benefit, Plan Merger [Abstract] EBP, Change in Net Asset Available for Benefit, Plan Merger EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]