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Earnings (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings per share [abstract] |
Schedule of Earnings (Loss) Per Share | Details of the calculation of the net income (loss) and the weighted average number of shares used in the earnings per share computations are as follows:
For the years ended December 31, | 2020 | 2019
Common shareholders’ net income (loss) for basic earnings per share |  | $ | 2,404 |  |  | $ | 2,618 |
Add: Increase in income due to convertible instruments(1) |  | 10 |  |  | 10 |
Common shareholders’ net income (loss) on a diluted basis |  | $ | 2,414 |  |  | $ | 2,628 |
Weighted average number of common shares outstanding for basic earnings per share (in millions) |  | 585 |  |  | 592 |
Add: Dilutive impact of stock options(2) (in millions) |  | — |  |  | 1 |
Dilutive impact of convertible instruments(1) (in millions) |  | 4 |  |  | 4 |
Weighted average number of common shares outstanding on a diluted basis (in millions) |  | 589 |  |  | 597 |
Basic earnings (loss) per share |  | $ | 4.11 |  |  | $ | 4.42 |
Diluted earnings (loss) per share |  | $ | 4.10 |  |  | $ | 4.40 |
(1) The convertible instruments are the SLEECS B issued by SLCT I. (2) Excludes the impact of 1 million stock options for the year ended December 31, 2020 (1 million for the year ended December 31, 2019) because these stock options were anti-dilutive for the period.

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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 2019-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_66&doctype=Standard -URIDate 2019-03-27 + Details
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