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(LOSS) EARNINGS PER COMMON SHARE (Tables) | 12 Months Ended
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Dec. 31, 2020
(LOSS) EARNINGS PER COMMON SHARE |
(Loss) Earnings Per Common Share |
($ millions) |  | 2020 |  | 2019 |
Net (loss) earnings |  | (4 319 | ) | 2 899 |
(millions of common shares) |  |  |  |  |
Weighted average number of common shares |  | 1 526 |  | 1 559 |
Dilutive securities: |  |  |  |  |
| Effect of share options |  | — |  | 2 |
Weighted average number of diluted common shares |  | 1 526 |  | 1 561 |
(dollars per common share) |  |  |  |  |
Basic and diluted (loss) earnings per share |  | (2.83 | ) | 1.86 |

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- Definition The disclosure of earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2020-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_66&doctype=Standard -URIDate 2020-01-01 + Details
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