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Earnings per share - Summary of weighted average number of ordinary shares (Details) |  | 12 Months Ended
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May 01, 2019 shares | Dec. 31, 2025 d shares | Dec. 31, 2024 d shares | Dec. 31, 2023 d shares
Accumulated number of shares issued |  |  |  |  |  |  |
Accumulated Number Of Shares Issued |  | 177,566,837,025 |  | 185,280,763,921 |  | 189,510,838,199 |
Number Of Shares |  | 477,157,399 |  | 498,859,764 |  | 512,753,119 |
Days | d |  | 365 |  | 366 |  | 365 |
Weighted average number of ordinary shares outstanding | 485,494,934 | 486,484,485 | [1] | 506,231,595 | [1] | 519,207,776 | [1]
Common stocks |  |  |  |  |  |  |
Accumulated number of shares issued |  |  |  |  |  |  |
Accumulated Number Of Shares Issued |  | 179,923,930,646 |  | 186,347,761,912 |  | 187,756,015,279 |
Number Of Shares |  | 485,494,934 |  | 503,445,325 |  | 512,759,471 |
Preferred stocks |  |  |  |  |  |  |
Accumulated number of shares issued |  |  |  |  |  |  |
Accumulated Number Of Shares Issued |  |  |  |  |  | 2,097,840,000 |
Number Of Shares |  |  |  |  |  | 0 |
Treasury stocks |  |  |  |  |  |  |
Accumulated number of shares issued |  |  |  |  |  |  |
Accumulated Number Of Shares Issued |  | (2,357,093,621) |  | (1,066,997,991) |  | (343,017,080) |
Number Of Shares |  | (8,337,535) |  | (4,585,561) |  | (6,352) |
[1] | The number of ordinary shares issued is 485,494,934 shares as of December 31, 2025, and the above weighted-average number of shares outstanding has been calculated by reflecting the following: (i) the conversion of 17,482,000 convertible preferred shares issued on May 1, 2019 into ordinary shares on May 1, 2023, for the year ended December 31, 2023; and (ii) changes in treasury stock, including shares acquired and subsequently retired, for the years ended December 31, 2023, 2024 and 2025.

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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 2025-01-01 -Paragraph 70 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_70_b&doctype=Standard -URIDate 2025-03-27 + Details
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