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Debt - Summary of Minimum Lease Payments of Finance Lease Liabilities and Effect of Discounting (Detail) - CAD CAD in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted minimum finance lease payments	CAD 739	CAD 139
Effect of discounting	(426)	(24)
Present value of minimum finance lease payments - total finance lease liabilities	313	115
Less current portion	(27)	(33)
Long-term finance lease liabilities	286	82
2018 [member]
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted minimum finance lease payments	51	34
Present value of minimum finance lease payments - total finance lease liabilities	48	34
Later than one year and not later than five years [member]
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted minimum finance lease payments	134	43
Present value of minimum finance lease payments - total finance lease liabilities	106	39
Thereafter [member]
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted minimum finance lease payments	554	62
Present value of minimum finance lease payments - total finance lease liabilities	CAD 159	CAD 42

X

- Definition

The amount of current finance lease liabilities. [Refer: Finance lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
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-URIDate 2017-03-09

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- 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 payments over the finance lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with any amounts guaranteed by the lessee or by a party related to the lessee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2017-01-01
-Paragraph 31
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-URIDate 2017-03-09

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X

- Definition

The present value of minimum finance lease payments payable. [Refer: Minimum finance lease payments payable]

+ 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
-Paragraph 31
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-URIDate 2017-03-09

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- Definition

The amount of non-current finance lease liabilities. [Refer: Finance lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-02&anchor=para_55&doctype=Standard&book=B
-URIDate 2017-03-09

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- Definition

Discounting effect finance lease liabilities.

+ References

No definition available.

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