Accounting for Financial Instruments - Summary of Contractual Undiscounted Cash Flow Requirements for Financial Liabilities (Detail) - Liquidity risk [member] CAD in Millions	Dec. 31, 2017 CAD
Disclosure of detailed information about financial instruments [line items]
Trade accounts payable and other liabilities	CAD 2,313
Debt	6,105
Estimated interest payments on debt	5,178
2018 [member]
Disclosure of detailed information about financial instruments [line items]
Trade accounts payable and other liabilities	2,313
Debt	28
Estimated interest payments on debt	346
2020 [member]
Disclosure of detailed information about financial instruments [line items]
Debt	28
Estimated interest payments on debt	692
2022 [member]
Disclosure of detailed information about financial instruments [line items]
Debt	1,119
Estimated interest payments on debt	626
Thereafter [member]
Disclosure of detailed information about financial instruments [line items]
Debt	4,930
Estimated interest payments on debt	CAD 3,514

The amount of contractual undiscounted cash flows in relation to bank borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Note Effective 2019-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph IG31A
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_IG31A&doctype=Implementation%20Guidance
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph B11D
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_B11D&doctype=Appendix&seq=2
-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

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- Definition

The amount of contractual undiscounted cash flows in relation to trade and other payables. [Refer: Trade and other payables]

+ References

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- Definition

Estimated interest payments on debt, undiscounted cash flows.

+ References

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