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Share Capital and Earnings Per share - Additional Information (Detail) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 14, 2019 | Mar. 13, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Retained earnings [member] |  |  |  |
Disclosure of Dividends [line items] |  |  |  |
Purchase of treasury shares |  | $ 132 |  | $ 662
Issued capital [Member] |  |  |  |
Disclosure of Dividends [line items] |  |  |  |
Purchase of treasury shares |  | $ 121 |  | $ 677
Common shares [Member] |  |  |  |
Disclosure of Dividends [line items] |  |  |  |
Average per common share | $ 25.26 |  | $ 24.86 | $ 23.22
Share purchased and cancelled subsequently | 16.5 |  | 10.2 | 57.6
Total Cost of Share | $ 416 |  | $ 253 | $ 1,300
Common shares [Member] | Major ordinary share transactions [Member] |  |  |  |
Disclosure of Dividends [line items] |  |  |  |
Dividend declared but not paid |  |  | $ 0.28 |

X
- Definition The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 137 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_137_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease in equity resulting from the purchase of treasury shares. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_106_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Number of Share Purchased And Cancelled Shares. + References No definition available. + Details
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- Definition Share purchased and cancelled value. + References No definition available. + Details
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- Details
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- Details
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- Details
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