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Stockholders' equity - Share buyback (Details) R$ / shares in Units, $ / shares in Units, R$ in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2021 shares | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2021 BRL (R$) | Jun. 30, 2021 R$ / shares shares
Disclosure of classes of share capital [line items] |  |  |  |  |
Repurchased shares will be cancelled after expiration | 12 months |  |  |  |
Value of shares acquired |  |  | $ 2,004 | R$ 10,407 |
Common share |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Share buyback program, number of shares authorized to be repurchased | 270,000,000 |  |  |  |
Total number of outstanding shares | 5.30% |  |  |  |
Number of shares repurchased |  | 93,088,200 | 93,088,200 |  | 93,088,200
Repurchased shares average price | (per share) |  | $ 21.52 | $ 21.52 |  | R$ 111.79
Value of shares acquired | $ |  | $ 2,004 |  |  |

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- Definition The decrease in equity resulting from the purchase of treasury shares. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_106_d&doctype=Standard -URIDate 2020-01-01 + Details
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