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Revenues - Summary of Revenue Disaggregated by Geographical Region (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | $ 8,948 | $ 11,934
China |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 1,861 | 1,983
Japan |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 1,211 | 1,813
South Korea |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 982 | 1,174
India |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 588 | 947
Other |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 757 | 1,077
United States |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 1,189 | 1,617
Canada |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 1,027 | 1,376
Latin America |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 166 | 236
Germany |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 610 | 486
Finland |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 124 | 263
Spain |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 163 | 224
Other |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | $ 270 | $ 738

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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_113_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_114&doctype=Standard -URIDate 2020-01-01 + Details
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