FAIR VALUE MEASUREMENTS (Details) - EBP 002 - USD ($)	Dec. 31, 2025	Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]
Total investments	$ 523,129,984	$ 290,313,315
Level 1 - Unadjusted quoted prices in active markets for identical assets:
EBP, Investment, Fair Value and NAV [Line Items]
Total investments	523,129,984	290,313,315
Mutual funds \| Level 1 - Unadjusted quoted prices in active markets for identical assets:
EBP, Investment, Fair Value and NAV [Line Items]
Total investments	489,804,957	283,504,620
Common stock—Canadian Pacific Kansas City Limited stock \| Level 1 - Unadjusted quoted prices in active markets for identical assets:
EBP, Investment, Fair Value and NAV [Line Items]
Total investments	14,443,603	5,152,034
Self-directed brokerage account \| Level 1 - Unadjusted quoted prices in active markets for identical assets:
EBP, Investment, Fair Value and NAV [Line Items]
Total investments	$ 18,881,424	$ 1,656,661

Fair value of investment, excluding plan interest in master trust, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

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+ Details

- 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.

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