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(LOSS) EARNINGS PER COMMON SHARE | 12 Months Ended
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Dec. 31, 2021
(LOSS) EARNINGS PER COMMON SHARE |
(LOSS) EARNINGS PER COMMON SHARE | 11. EARNINGS (LOSS) PER COMMON SHARE ​
​ | ​ | ​ | ​ | ​ | ​
($ millions) |  | 2021 |  | 2020 |
Net earnings (loss) |  | 4 119 |  | (4 319) | ​
​ | ​ | ​ | ​ | ​ | ​
(millions of common shares) | ​ | ​ | ​ | ​ | ​
Weighted average number of common shares |  | 1 488 |  | 1 526 | ​
Dilutive securities: | ​ | ​ | ​ | ​ | ​
Effect of share options |  | 1 |  | - | ​
Weighted average number of diluted common shares |  | 1 489 |  | 1 526 | ​
​ | ​ | ​ | ​ | ​ | ​
(dollars per common share) | ​ | ​ | ​ | ​ | ​
Basic and diluted earnings (loss) per share |  | 2.77 |  | (2.83) | ​
​

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