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Per Share Amounts - Additional Information (Detail) - CAD ($) $ / shares in Units, $ in Millions |  | 9 Months Ended
--- | --- | ---
Nov. 02, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Dividends paid on common shares |  |  | $ 77
Dividends paid (in CAD per share) |  | $ 0.0525 | $ 0.0625
Dividends declared (in CAD per share) | $ 0.0350 |  |
Common shares |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Dividends paid on common shares |  | $ 106 | $ 77
Preferred Shares |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Dividends paid on common shares |  | $ 26 |
Potential ordinary share transactions | Preferred Shares |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Dividends paid on common shares | $ 8 |  |

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- Definition The amount of dividends recognised as distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 107 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_107&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of dividends paid per ordinary share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2021-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=34&code=ifrs-tx-2021-en-r&anchor=para_16A_f&doctype=Standard -URIDate 2021-03-24 + Details
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