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SHARE CAPITAL (Tables) | 12 Months Ended
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Dec. 31, 2020
SHARE CAPITAL. |
Schedule of share repurchase activities |
($ millions, except as noted) |  | 2020 |  | 2019 |
Share repurchase activities (thousands of common shares) |  |  |  |  |
| Shares repurchased |  | 7 527 |  | 55 298 |
Amounts charged to |  |  |  |  |
| Share capital |  | 124 |  | 905 |
| Retained earnings |  | 183 |  | 1 369 |
Share repurchase cost |  | 307 |  | 2 274 |
Average repurchase cost per share |  | 40.83 |  | 41.12 |
Schedule of liability for share repurchases |
($ millions) |  | December 31 2020 |  | December 31 2019 |
Amounts charged to |  |  |  |  |
| Share capital |  | — |  | 65 |
| Retained earnings |  | — |  | 103 |
Liability for share purchase commitment |  | — |  | 168 |

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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 2020-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_10_e&doctype=Standard -URIDate 2020-01-01 + Details
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