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Description of Business and Segmented Disclosures - Schedule of Geographical Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | $ 13,227 | $ 20,180 | $ 20,843
Non-Current Assets | 29,758 | 32,429 |
Canada [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 8,399 | 11,798 | 11,694
Non-Current Assets | 26,168 | 28,336 |
United States [Member] |  |  |
Disclosure Of Geographical Areas [Line Items] |  |  |
Revenue | 4,828 | 8,382 | $ 9,149
Non-Current Assets | $ 3,590 | $ 4,093 |

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- Definition The amount of non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets and rights arising under insurance contracts. [Refer: Deferred tax assets; Financial instruments, class [member]; Non-current assets; Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 33 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_33_b&doctype=Standard -URIDate 2020-01-01 + Details
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