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Investments in Associates and Joint Ventures - Summary of Investments in Associates and Joint Ventures (Detail) - CAD CAD in Millions | 12 Months Ended
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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

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- Definition The increase (decrease) in regulatory deferral account debit balances resulting from changes in foreign exchange rates. [Refer: Regulatory deferral account debit balances] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 14 -IssueDate 2017-01-01 -Paragraph 33 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=14&date=2017-03-01&anchor=para_33_a_iii&doctype=Standard -URIDate 2017-03-09 + Details
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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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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 -Number 12 -IssueDate 2017-01-01 -Paragraph B16 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B16_c&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective on first application of IFRS 9 -Name IFRS -Number 4 -IssueDate 2017-01-01 -Paragraph 39M -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=4&date=2017-03-01&anchor=para_39M_b&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_91_a&doctype=Standard -URIDate 2017-03-09 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B16 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B16_a&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 19E -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_19E_a&doctype=Standard -URIDate 2017-03-09 + Details
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