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Shareholders' equity - Purchase of Equity Securities (Details) - EUR (€)
€ / shares in Units, € in Millions
1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 6 Months Ended 7 Months Ended 8 Months Ended 9 Months Ended 10 Months Ended 11 Months Ended 12 Months Ended
Dec. 31, 2023
Nov. 30, 2023
Oct. 31, 2023
Sep. 30, 2023
Aug. 31, 2023
Jul. 31, 2023
Jun. 30, 2023
May 31, 2023
Apr. 30, 2023
Mar. 31, 2023
Feb. 28, 2023
Jan. 31, 2023
Feb. 28, 2023
Mar. 31, 2023
Apr. 30, 2023
May 31, 2023
Jun. 30, 2023
Jul. 31, 2023
Aug. 31, 2023
Sep. 30, 2023
Oct. 31, 2023
Nov. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Equity [Abstract]                                                
Total number of shares purchased (in shares) 0 0 0 0 0 144,745 263,635 283,210 239,865 337,136 294,059 57,478 351,537 688,673 928,538 1,211,748 1,475,383 1,620,128 1,620,128 1,620,128 1,620,128 1,620,128 1,620,128 8,538,787
Average price paid per share (Euro per share) € 0 € 0 € 0 € 0 € 0 € 657.99 € 663.39 € 617.07 € 589.92 € 589.74 € 611.28 € 609.46                     € 617.23  
Maximum value of shares that may yet be purchased (€ millions) € 10,800.0 € 10,800.0 € 10,800.0 € 10,800.0 € 10,800.0 € 10,800.0 € 10,895.2 € 11,070.1 € 11,244.9 € 11,386.4 € 11,585.2 € 11,765.0