Disposal Group, Including Discontinued Operation, Consideration, Permanent Easement Assets

No definition available.

Name:	cp_DisposalGroupIncludingDiscontinuedOperationConsiderationPermanentEasementAssets
Namespace Prefix:	cp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Disposal Group, Including Discontinued Operation, Consideration, Property

+ References

No definition available.

+ Details

Name:	cp_DisposalGroupIncludingDiscontinuedOperationConsiderationProperty
Namespace Prefix:	cp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Recognition Of Deferred Gain On Sale Of Property

+ References

No definition available.

+ Details

Name:	cp_RecognitionOfDeferredGainOnSaleOfProperty
Namespace Prefix:	cp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredGainOnSaleOfProperty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainLossOnDispositionOfAssets1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfProductiveAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Property sale (Details) $ in Millions, $ in Millions	3 Months Ended		12 Months Ended
Property sale (Details) $ in Millions, $ in Millions	Mar. 31, 2021 CAD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2022 CAD ($)	Dec. 31, 2021 CAD ($)
Discontinued Operations and Disposal Groups [Abstract]
Consideration, sale of assets	$ 103
Cash proceeds from sale of assets	61
Consideration received, property	33
Consideration received, permanent easement assets	9
Gain on sale of assets	50	$ 38
Deferred gain on sale of assets	$ 53
Recognition of deferred gain			$ 14	$ 13