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SHARE CAPITAL (Details) $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 23, 2019 shares | May 01, 2019 shares | Feb. 07, 2022 shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2020 CAD ($) shares | Dec. 31, 2019 CAD ($) $ / shares shares | Dec. 31, 2019 CAD ($) shares | Jan. 31, 2021 shares | Dec. 31, 2018 shares
Share Capital |  |  |  |  |  |  |  |  |
Amended treasury shares authorized for repurchase | shares | 78,549,178 | 50,252,231 |  |  |  |  |  |  |
Purchase of common shares for cancellation (in shares) | shares |  |  |  |  | 7,527,000 |  | 55,298,000 |  |
Issued Capital |  |  |  |  | $ 307 |  | $ 2,274 |  |
Share repurchase cost |  |  |  |  | $ 307 |  | 2,274 |  |
Average repurchase cost per share | $ / shares |  |  |  | $ 40.83 |  | $ 41.12 |  |  |
Liability for share purchase commitment |  |  |  |  |  | $ 168 | $ 168 |  |
Common shares issued | shares |  |  |  | 1,525,151,000 | 1,525,151,000 | 1,531,874,000 | 1,531,874,000 |  | 1,584,484,000
Subsequent Event |  |  |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |  |  |
Amended treasury shares authorized for repurchase | shares |  |  | 44,000,000 |  |  |  |  |  |
Percentage of amended treasury shares authorized for repurchase |  |  | 2.90% |  |  |  |  |  |
Common shares issued | shares |  |  |  |  |  |  |  | 1,525,150,794 |
Common shares outstanding | shares |  |  |  |  |  |  |  | 1,525,150,794 |
Share capital |  |  |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |  |  |
Issued Capital |  |  |  |  | $ 124 |  | $ 905 |  |
Share repurchase cost |  |  |  |  | 124 |  | 905 |  |
Liability for share purchase commitment |  |  |  |  |  | $ 65 | 65 |  |
Retained earnings |  |  |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |  |  |
Issued Capital |  |  |  |  | 183 |  | 1,369 |  |
Share repurchase cost |  |  |  |  | $ 183 |  | 1,369 |  |
Liability for share purchase commitment |  |  |  |  |  | $ 103 | $ 103 |  |

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