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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, 2019 | Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | $ 11,934 | $ 12,564
China |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 1,983 | 2,060
Japan |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 1,813 | 1,880
South Korea |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 1,174 | 1,515
India |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 947 | 981
Other |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 1,077 | 1,207
United States |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 1,617 | 1,609
Canada |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 1,376 | 932
Latin America |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 236 | 297
Germany |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 486 | 561
Finland |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 263 | 242
Netherlands |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | 176 | 240
Other |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Revenue | $ 786 | $ 1,040

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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 2019-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_113_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_114&doctype=Standard -URIDate 2019-03-27 + Details
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