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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
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