Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2022	Mar. 17, 2023	Jun. 30, 2022
Entity Information [Line Items]
Document Type	10-K/A
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-01342
Entity Registrant Name	CANADIAN PACIFIC RAILWAY LTD/CN
Entity Incorporation, State or Country Code	Z4
Entity Tax Identification Number	98-0355078
Entity Address, Address Line One	7550 Ogden Dale Road S.E.
Entity Address, City or Town	Calgary
Entity Address, State or Province	AB
Entity Address, Postal Zip Code	T2C 4X9
City Area Code	(403)
Local Phone Number	319-7000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 64,936,373,457
Entity Common Stock, Shares Outstanding		930,871,358
Amendment Flag	true
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Central Index Key	0000016875
Entity Address, Country	CA
Amendment Description	Canadian Pacific Railway Limited, a corporation incorporated under the Canada Business Corporations Act (Company), qualifies as a foreign private issuer in the U.S. for purposes of the Securities Exchange Act of 1934, as amended (Exchange Act). Although as a foreign private issuer the Company is not required to do so, the Company currently continues to file annual reports on Form 10-K, quarterly reports on Form 10-Q, and current reports on Form 8-K with the Securities and Exchange Commission (SEC) instead of filing reports on forms available to foreign private issuers. The Company prepares and files a management proxy circular and related material under Canadian requirements. As the Company’s management proxy circular is not filed pursuant to Regulation 14A, the Company may not incorporate by reference information required by Part III of its Form 10-K from its management proxy circular. The Company filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2022 (2022 Form 10-K) on February 24, 2023. In reliance upon and as permitted by Instruction G(3) to Form 10-K, the Company is filing this Amendment No. 1 on Form 10-K/A in order to include in the 2022 Form 10-K the Part III information not previously included in the 2022 Form 10-K. No attempt has been made in this Amendment No. 1 on Form 10-K/A to modify or update the other disclosures presented in the 2022 Form 10-K. This Amendment No. 1 on Form 10-K/A does not reflect events occurring after the filing of the 2022 Form 10-K. Accordingly, this Amendment No. 1 on Form 10-K/A should be read in conjunction with the 2022 Form 10-K and the Company’s other filings with the SEC.In this Amendment No. 1 on Form 10-K/A, we also refer to Canadian Pacific Railway Limited as “Canadian Pacific,” “CP,” “we,” “us,” “our,” “our corporation,” or “the corporation.” References to GAAP mean generally accepted accounting principles in the United States.All references to our websites contained herein do not constitute incorporation by reference of information contained on such websites and such information should not be considered part of this document.
Common Shares, without par value, of Canadian Pacific Railway Limited
Entity Information [Line Items]
Title of 12(b) Security	Common Shares, without par value, of Canadian Pacific Railway Limited
Trading Symbol	CP
Security Exchange Name	NYSE
Perpetual 4% Consolidated Debenture Stock of Canadian Pacific Railway Company
Entity Information [Line Items]
Title of 12(b) Security	Perpetual 4% Consolidated Debenture Stock of Canadian Pacific Railway Company
Trading Symbol	CP/40
Security Exchange Name	NYSE