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EARNINGS (LOSS) PER SHARE - Basic earnings (losses) per share (Details) - BRL (R$) R$ / shares in Units, shares in Thousands, R$ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Basic earnings per share |  |  |  |  |
Resulted of the period attributable to controlling shareholders' | R$ 10,035,111 | R$ (2,057,101) | R$ 7,277,867 | R$ (15,479,631) | R$ (15,479,631)
Weighted average number of shares in the period |  |  | 1,361,264 |  | 1,361,264
Weighted average treasury shares |  |  | (12,042) |  | (12,042)
Weighted average number of outstanding shares |  |  | 1,349,222 |  | 1,349,222
Basic loss per common share - RS | R$ 7.43770 | R$ (1.52466) | R$ 5.39412 | R$ (11.47301) | R$ (11.47301)

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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator). + 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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- Definition The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 81B -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_81B_a_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2020-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_70_b&doctype=Standard -URIDate 2020-01-01 + Details
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