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Share Capital (Tables) | 12 Months Ended
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Dec. 31, 2022
Share Capital |
Schedule of share repurchase activities | The following table summarizes the share repurchase activities during the period:
​ | ​ | ​ | ​ | ​ | ​
($ millions, except as noted) |  | 2022 |  | 2021 |
Share repurchase activities (thousands of common shares) |  |  |  |  | ​
Shares repurchased |  | 116 908 |  | 83 959 | ​
Amounts charged to | ​ | ​ | ​ | ​ | ​
Share capital |  | 1 947 |  | 1 382 | ​
Retained earnings |  | 3 188 |  | 922 | ​
Share repurchase cost |  | 5 135 |  | 2 304 | ​
Average repurchase cost per share |  | 43.92 |  | 27.45 | ​
​
Schedule of liability for share repurchases | Under an automatic repurchase plan agreement with an independent broker, the company has recorded the following liability for share repurchases that may take place during its internal blackout period:
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31 | ​ | December 31 | ​
($ millions) |  | 2022 |  | 2021 |
Amounts charged to | ​ | ​ | ​ | ​ | ​
Share capital |  | 136 |  | 120 | ​
Retained earnings |  | 214 |  | 110 | ​
Liability for share purchase commitment |  | 350 |  | 230 | ​

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- Definition The disclosure of repurchase and reverse repurchase agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 10 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_10_e&doctype=Standard -URIDate 2022-03-24 + Details
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