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Debt - Summary of Minimum Lease Payments of Finance Lease Liabilities and Effect of Discounting (Detail) - CAD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted minimum finance lease payments	$ 753	$ 739
Effect of discounting	(415)	(426)
Present value of minimum finance lease payments - total finance lease liabilities	338	313
Less current portion	(32)	(27)
Long-term finance lease liabilities	306	286
Less Than 1 Year [member]
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted minimum finance lease payments	50	51
Present value of minimum finance lease payments - total finance lease liabilities	46	48
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	147	134
Present value of minimum finance lease payments - total finance lease liabilities	114	106
More Than 5 Years [member]
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted minimum finance lease payments	556	554
Present value of minimum finance lease payments - total finance lease liabilities	$ 178	$ 159

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 2018-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-02&anchor=para_55&doctype=Standard&book=b
-URIDate 2018-03-16

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- Definition

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+ 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 2018-01-01
-Paragraph 31
-Subparagraph b
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-URIDate 2018-03-16

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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
-Number 17
-IssueDate 2018-01-01
-Paragraph 31
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-URIDate 2018-03-16

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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
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-IssueDate 2018-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-02&anchor=para_55&doctype=Standard&book=b
-URIDate 2018-03-16

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- Definition

Discounting effect finance lease liabilities.

+ References

No definition available.

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