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SHARE CAPITAL (Tables) | 12 Months Ended
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Dec. 31, 2021
SHARE CAPITAL. |
Schedule of share repurchase activities | The following table summarizes the share repurchase activities during the period:
​ | ​ | ​ | ​ | ​ | ​
($ millions, except as noted) |  | 2021 |  | 2020 |
Share repurchase activities (thousands of common shares) |  |  |  |  | ​
Shares repurchased |  | 83 959 |  | 7 527 | ​
Amounts charged to | ​ | ​ | ​ | ​ | ​
Share capital |  | 1 382 |  | 124 | ​
Retained earnings |  | 922 |  | 183 | ​
Share repurchase cost |  | 2 304 |  | 307 | ​
Average repurchase cost per share |  | 27.45 |  | 40.83 | ​
​
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) |  | 2021 |  | 2020 |
Amounts charged to | ​ | ​ | ​ | ​ | ​
Share capital |  | 120 |  | - | ​
Retained earnings |  | 110 |  | - | ​
Liability for share purchase commitment |  | 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 2021-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_10_e&doctype=Standard -URIDate 2021-03-24 + Details
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