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Taxation - Summary of taxation by type (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of income taxes [line items]      
Current taxation € 2,722 € 2,008 € 1,908
Deferred taxation (1,059) 3,122 399
Effective tax amount 1,662 5,130 2,306
DT IFRS-EU      
Disclosure of income taxes [line items]      
Effective tax amount 2,970 1,725 1,877
DT IFRS-IASB adjustment      
Disclosure of income taxes [line items]      
Effective tax amount 1,308 (3,405) (429)
Netherlands      
Disclosure of income taxes [line items]      
Current taxation 601 498 459
Deferred taxation (141) 901 269
Effective tax amount 460 1,399 729
Rest of the world      
Disclosure of income taxes [line items]      
Current taxation 2,121 1,510 1,448
Deferred taxation (918) 2,221 129
Effective tax amount € 1,202 € 3,731 € 1,578