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SHARE CAPITAL (Details) $ in Millions |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 23, 2019 CAD ($) shares | May 01, 2019 shares | Nov. 14, 2018 shares | May 01, 2018 shares | Dec. 31, 2019 CAD ($) $ / shares | Dec. 31, 2019 CAD ($) shares | Dec. 31, 2018 CAD ($) $ / shares | Dec. 31, 2018 CAD ($) shares
Share Capital |  |  |  |  |  |  |  |
Treasury shares authorized for repurchase | shares |  |  |  | 52,285,330 |  |  |  |
Amended treasury shares authorized for repurchase | shares | 78,549,178 | 50,252,231 | 81,695,830 |  |  |  |  |
Treasury share repurchase authorized amount | $ 2,000 |  |  |  |  |  |  |
Purchase of common shares for cancellation (in shares) | shares |  |  |  |  |  | 55,298,000 |  | 64,426,000
Issued Capital |  |  |  |  |  | $ 2,274 |  | $ 3,053
Share repurchase cost |  |  |  |  |  | 2,274 |  | 3,053
Average repurchase cost per share | $ / shares |  |  |  |  | $ 41.12 |  | $ 47.38 |
Liability for share purchase commitment |  |  |  |  | $ 168 | 168 | $ 263 | 263
Share capital |  |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |  |
Issued Capital |  |  |  |  |  | 905 |  | 1,040
Share repurchase cost |  |  |  |  |  | 905 |  | 1,040
Liability for share purchase commitment |  |  |  |  | 65 | 65 | 111 | 111
Retained earnings |  |  |  |  |  |  |  |
Share Capital |  |  |  |  |  |  |  |
Issued Capital |  |  |  |  |  | 1,369 |  | 2,013
Share repurchase cost |  |  |  |  |  | 1,369 |  | 2,013
Liability for share purchase commitment |  |  |  |  | $ 103 | $ 103 | $ 152 | $ 152

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