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Share Capital - Share repurchases (Details) - CAD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Share Capital |  |
Shares repurchased | 116,908 | 83,959
Share repurchase cost | $ 5,135 | $ 2,304
Average repurchase cost per share | $ 43.92 | $ 27.45
Liability for share purchase commitment | $ 350 | $ 230
Share capital |  |
Share Capital |  |
Share repurchase cost | 1,947 | 1,382
Liability for share purchase commitment | 136 | 120
Retained earnings |  |
Share Capital |  |
Share repurchase cost | 3,188 | 922
Liability for share purchase commitment | $ 214 | $ 110

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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 2022-03-24 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_106_d&doctype=Standard -URIDate 2022-03-24 + Details
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