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Off balance sheet commitments - Summary of Amount of Guarantees Given and Received (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Guarantees received      
Disclosure of Guarantees [Line Items]      
Estimated financial effect of contingent liabilities € 1,288 € 1,272 € 1,229
Guarantees given      
Disclosure of Guarantees [Line Items]      
Estimated financial effect of contingent liabilities 4,298 3,936 3,815
Guarantees provided to banks in connection with credit facilities      
Disclosure of Guarantees [Line Items]      
Estimated financial effect of contingent liabilities 1,130 1,067 1,007
Other guarantees given      
Disclosure of Guarantees [Line Items]      
Estimated financial effect of contingent liabilities € 3,168 € 2,869 € 2,808