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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, 2022 EUR (€) shares € / shares | Dec. 31, 2021 EUR (€) shares € / shares | Dec. 31, 2020 EUR (€) shares € / shares | Dec. 31, 2019 EUR (€) shares € / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of options, beginning balance (in shares) | shares | 2,337,968 | 2,579,270 | 3,822,020 |
Number of options, options exercisable (in shares) | shares | 1,624,569 | 1,949,184 | 1,845,050 | 2,650,375
Number of options, options exercised (in shares) | shares | (490,373) | (190,076) | (868,655) |
Number of options, options cancelled (in shares) | shares | (9,626) | (51,216) | (91,305) |
Number of options, options forfeited (in shares) | shares |  | (10) | (282,790) |
Number of options, ending balance (in shares) | shares | 1,837,969 | 2,337,968 | 2,579,270 | 3,822,020
Average exercise price per share, beginning balance (in euros per share) | € / shares | € 77.13 | € 75.61 | € 70.58 |
Average exercise price per share, options exercisable (in euros per share) | € / shares | 78.89 | 78.15 | 74.51 | € 67.14
Average exercise price per share, options exercised (in euros per share) | € / shares | 71.39 | 59.53 | 59.20 |
Average exercise price per share, options cancelled (in euros per share) | € / shares | 80.56 | 65.84 | 87.73 |
Average exercise price per share, options forfeited (in euros per share) | € / shares |  | 50.48 | 54.12 |
Average exercise price per share, ending balance (in euros per share) | € / shares | € 78.64 | € 77.13 | € 75.61 | € 70.58
Total, beginning balance | € | € 180 | € 195 | € 270 |
Total, options exercisable | € | 128 | 152 | 137 | € 178
Total, options exercised | € | (35) | (11) | (52) |
Total, options cancelled | € | (1) | (3) | (8) |
Total, options forfeited | € |  | 0 | (15) |
Total, ending balance | € | € 145 | € 180 | € 195 | € 270

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