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Equity - Schedule of changes in retained earnings (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of equity [Line Items]      
Retained earnings, opening balance € 41,538 € 35,462  
Dividend and other distributions (2,671) (3,390) € (2,382)
Employee share plans (7) 27 29
Retained earings, closing balance 40,299 41,538 35,462
Retained earnings      
Disclosure of equity [Line Items]      
Retained earnings, opening balance 41,538 35,462 32,149
Transfer to/from other reserves 899 (8) 26
Result for the year 3,804 11,965 5,760
Dividend and other distributions (2,668) (3,349) (2,342)
Employee share plans (7) 15 12
Changes in composition of the group and other changes (3,222) (1,984) (143)
Retained earings, closing balance 40,299 41,538 35,462
Retained earnings | Impact IAS 29 on opening balance      
Disclosure of equity [Line Items]      
Retained earnings, opening balance € (45) (563)  
Retained earings, closing balance   € (45) € (563)