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Shareholders' equity - Purchase of Equity Securities (Details) - EUR (€)
€ / shares in Units, € in Millions
1 Months Ended 12 Months Ended 13 Months Ended 14 Months Ended 15 Months Ended 16 Months Ended 17 Months Ended 18 Months Ended 19 Months Ended 20 Months Ended 21 Months Ended 22 Months Ended 23 Months Ended 35 Months Ended 38 Months Ended
Nov. 30, 2022
Oct. 31, 2022
Sep. 30, 2022
Aug. 31, 2022
Jul. 31, 2022
Jun. 30, 2022
May 30, 2022
Apr. 30, 2022
Mar. 31, 2022
Feb. 28, 2022
Jan. 31, 2022
Dec. 31, 2022
Jan. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 23, 2022
Feb. 28, 2022
Mar. 31, 2022
Apr. 30, 2022
May 31, 2022
Jun. 30, 2022
Jul. 31, 2022
Aug. 31, 2022
Sep. 30, 2022
Oct. 31, 2022
Nov. 30, 2022
Dec. 31, 2022
Dec. 31, 2022
Dec. 31, 2025
Class of Stock [Line Items]                                                          
Total number of shares purchased (in shares) 152,323 237,399 907,391 673,412 666,112 717,092 675,117 808,095 1,241,647 1,150,011 1,107,187 8,538,787 1,107,187 14,358,838   203,001 2,257,198 3,498,845 4,306,940 4,982,057 5,699,149 6,365,261 7,038,673 7,946,064 8,183,463 8,335,786 8,538,787    
Treasury stock, repurchased                       € 4,639.7                                  
Purchase of treasury shares                       € 4,639.7   € 8,560.3 € 1,207.5                            
Treasury shares, cancellation process started during the year (in shares)                       3,337,825                                  
Cancelled shares (in shares)                           13,023,016                              
Average price paid per share (Euro per share) € 568.91 € 431.23 € 466.94 € 541.36 € 467.26 € 488.27 € 522.70 € 573.12 € 575.99 € 572.80 € 630.21 € 543.37       € 558.33                          
Maximum value of shares that may yet be purchased (€ millions) € 11,913.3 € 0.0 € 102.4 € 526.1 € 890.6 € 1,201.9 € 1,552.0 € 1,904.9 € 2,368.0 € 3,083.2 € 3,741.9         € 11,800.0                          
New share buyback program                                                          
Class of Stock [Line Items]                                                          
Total number of shares purchased (in shares)                       355,324                                  
Treasury stock, repurchased                       € 200.0                                  
Share buyback program 2020-2022                                                          
Class of Stock [Line Items]                                                          
Expected total value of purchased shares                                                       € 9,000.0  
Cancelled shares (in shares)                       3,337,825                                  
Forecast [Member] | Share Buyback Program 2022-2025                                                          
Class of Stock [Line Items]                                                          
Expected total value of purchased shares                                                         € 12,000.0
Expected shares to be purchased for award (in shares)                                                         € 2.0