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Income taxes - Components of (Provision for) Benefit from Income Taxes (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax Disclosure [Abstract]      
Netherlands € 10,297.5 € 7,927.0 € 8,453.5
Foreign 1,108.6 1,115.4 630.0
Income before income taxes 11,406.1 9,042.4 9,083.5
Income tax (expense) / benefit current (1,638.0) (1,424.1) (1,211.7)
Income tax (expense) / benefit deferred (12.8) 67.5 (58.4)
Income tax (expense) / benefit Netherlands (1,650.8) (1,356.6) (1,270.1)
Income tax (expense) / benefit current (359.1) (322.7) (441.3)
Income tax (expense) / benefit deferred (3.5) (1.3) 275.6
Income tax (expense) / benefit Foreign (362.6) (324.0) (165.7)
Total income tax (expense) / benefit current (1,997.1) (1,746.8) (1,653.0)
Total income tax (expense) / benefit deferred (16.3) 66.2 217.2
Provision for income taxes € (2,013.4) € (1,680.6) € (1,435.8)