Investments in Associates and Joint Ventures - Summary of Investments in Associates and Joint Ventures (Detail) - CAD CAD in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Disclosure of investments in subsidiaries joint ventures and associates [line items]
Beginning balance	CAD 1,012
Share of other comprehensive income	(1)	CAD 1
Ending balance	943	1,012
Investments in associates and joint ventures [member]
Disclosure of investments in subsidiaries joint ventures and associates [line items]
Beginning balance	1,012	1,017
Contributions	47	21
Changes in foreign exchange rates	(63)	(29)
Share of income	6	2
Share of other comprehensive income	(1)	1
Acquisition of AQM Copper Inc.	(58)
Ending balance	943	1,012
Investments in associates and joint ventures [member] \| Nueva Union [member]
Disclosure of investments in subsidiaries joint ventures and associates [line items]
Beginning balance	946	959
Contributions	43	13
Changes in foreign exchange rates	(64)	(28)
Share of income	4	2
Ending balance	929	946
Investments in associates and joint ventures [member] \| Others [member]
Disclosure of investments in subsidiaries joint ventures and associates [line items]
Beginning balance	66	58
Contributions	4	8
Changes in foreign exchange rates	1	(1)
Share of income	2
Share of other comprehensive income	(1)	1
Acquisition of AQM Copper Inc.	(58)
Ending balance	CAD 14	CAD 66

The increase (decrease) in regulatory deferral account debit balances resulting from changes in foreign exchange rates. [Refer: Regulatory deferral account debit balances]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
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-IssueDate 2017-01-01
-Paragraph 33
-Subparagraph a
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- Definition

The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries]

+ References

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- Definition

The entity's share of the other comprehensive income of associates and joint ventures accounted for using the equity method, net of tax. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2017-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective on first application of IFRS 9
-Name IFRS
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-IssueDate 2017-01-01
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- Definition

The entity's share of the profit (loss) from continuing operations of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Continuing operations [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss) from continuing operations]

+ References

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- Definition

The amount of support provided to a subsidiary by the investment entity or its subsidiaries without having a contractual obligation to do so. [Refer: Disclosure of investment entities [text block]; Subsidiaries [member]]

+ References

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Acquisition of subsidiary.

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Disclosure of Investment in subsidiaries joint ventures and associates.

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