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Consolidated shareholders’ equity - Summary of Stock Options Outstanding at Each Balance Sheet Date (Details) - Total stock option plans € / shares in Units, € in Millions | 12 Months Ended
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Dec. 31, 2023 EUR (€) shares € / shares | Dec. 31, 2022 EUR (€) shares € / shares | Dec. 31, 2021 EUR (€) shares € / shares | Dec. 31, 2020 EUR (€) shares € / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of options, beginning balance (in shares) | shares | 1,837,969 | 2,337,968 | 2,579,270 |
Number of options, options exercisable (in shares) | shares | 1,333,013 | 1,624,569 | 1,949,184 | 1,845,050
Number of options, options exercised (in shares) | shares | (504,956) | (490,373) | (190,076) |
Number of options, options cancelled (in shares) | shares |  | (9,626) | (51,216) |
Number of options, options forfeited (in shares) | shares |  |  | (10) |
Number of options, ending balance (in shares) | shares | 1,333,013 | 1,837,969 | 2,337,968 | 2,579,270
Average exercise price per share, beginning balance (in euros per share) | € / shares | € 78.64 | € 77.13 | € 75.61 |
Average exercise price per share, options exercisable (in euros per share) | € / shares | 80.53 | 78.89 | 78.15 | € 74.51
Average exercise price per share, options exercised (in euros per share) | € / shares | 73.65 | 71.39 | 59.53 |
Average exercise price per share, options cancelled (in euros per share) | € / shares |  | 80.56 | 65.84 |
Average exercise price per share, options forfeited (in euros per share) | € / shares |  |  | 50.48 |
Average exercise price per share, ending balance (in euros per share) | € / shares | € 80.53 | € 78.64 | € 77.13 | € 75.61
Total, beginning balance | € | € 145 | € 180 | € 195 |
Total, options exercisable | € | 107 | 128 | 152 | € 137
Total, options exercised | € | (37) | (35) | (11) |
Total, options cancelled | € |  | (1) | (3) |
Total, options forfeited | € |  |  | 0 |
Total, ending balance | € | € 107 | € 145 | € 180 | € 195

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