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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]      
Income € 18,121 € 30,418 € 20,093
Expenses 12,084 13,060 11,708
Taxation 1,662 5,130 2,306
Non-controlling interests 235 102 128
Net result 4,140 12,126 5,951
Adjustment of the EU 'IAS 39 carve out'      
Disclosure of operating segments [line items]      
Income 4,455 (11,856) (1,603)
Taxation 1,308 (3,405) (429)
Net result 3,147 (8,451) (1,174)
Results IFRS-EU      
Disclosure of operating segments [line items]      
Income 22,575 18,561 18,490
Expenses 12,084 13,060 11,708
Taxation 2,970 1,725 1,877
Non-controlling interests 235 102 128
Net result € 7,287 € 3,674 € 4,776