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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
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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

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- 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 -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 + Details
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Balance Type: | credit
Period Type: | instant

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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. + Details
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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 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_31_b&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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Balance Type: | credit
Period Type: | instant

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- 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 -Number 17 -IssueDate 2017-01-01 -Paragraph 31 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_31_b&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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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 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Discounting effect finance lease liabilities. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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- Details
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- Details
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