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Debt - Finance Lease Liabilities - Additional Information (Detail) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]
Finance lease liabilities	CAD 313	CAD 115
Fort Hills Energy Limited Partnership [member]
Disclosure of detailed information about borrowings [line items]
Finance lease liabilities	CAD 207
Lease term	25 years
Lease renewal option periods	Four additional five-year periods
Property plant and equipment under finance leases [member]
Disclosure of detailed information about borrowings [line items]
Carrying amount of assets under finance leases	CAD 406	CAD 220

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of liabilities related to finance leases.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2019-01-01
-Name IAS
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-URIDate 2017-03-09

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- Definition

The amount of assets recognised by the entity, which are leased under finance leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
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-IssueDate 2017-01-01
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- Definition

Description of finance lease renewal options.

+ References

No definition available.

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- Definition

Description of lease agreements term.

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