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Financial Instruments and Financial Risk Management - Summary of Contractual Undiscounted Cash Flow Requirements for Financial Liabilities (Detail) - Liquidity risk [member] $ in Millions	Dec. 31, 2018 CAD ($)
Disclosure of detailed information about financial instruments [line items]
Trade accounts payable and other liabilities	$ 2,333
Debt	5,227
Estimated interest payments on debt	5,052
Less Than 1 Year [member]
Disclosure of detailed information about financial instruments [line items]
Trade accounts payable and other liabilities	2,333
Estimated interest payments on debt	317
2-3 Years [member]
Disclosure of detailed information about financial instruments [line items]
Debt	190
Estimated interest payments on debt	625
4-5 Years [member]
Disclosure of detailed information about financial instruments [line items]
Debt	575
Estimated interest payments on debt	582
More Than 5 Years [member]
Disclosure of detailed information about financial instruments [line items]
Debt	4,462
Estimated interest payments on debt	$ 3,528

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Note Effective 2019-01-01
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph IG31A
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_IG31A&doctype=Implementation%20Guidance
-URIDate 2018-03-16

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-IssueDate 2018-01-01
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-URIDate 2018-03-16

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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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Note Effective 2019-01-01
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph IG31A
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_IG31A&doctype=Implementation%20Guidance
-URIDate 2018-03-16

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-URIDate 2018-03-16

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- Definition

Estimated interest payments on debt, undiscounted cash flows.

+ References

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