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Segments - Summary of reconciliation between IFRS and underlying income, expenses and net result (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of operating segments [line items]      
Income € 21,087 € 18,121 € 30,418
Expenses 13,315 12,084 13,060
Taxation 2,181 1,662 5,130
Non-controlling interests 258 235 102
Net result 5,334 4,140 12,126
EU IAS 39 carve out impact      
Disclosure of operating segments [line items]      
Income 1,528 4,455 (11,856)
Taxation 470 1,308 (3,405)
Net result 1,058 3,147 (8,451)
Results IFRS-EU      
Disclosure of operating segments [line items]      
Income 22,615 22,575 18,561
Expenses 13,315 12,084 13,060
Taxation 2,650 2,970 1,725
Non-controlling interests 258 235 102
Net result € 6,392 € 7,287 € 3,674