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Equity - Schedule of changes in retained earnings (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of equity [Line Items]      
Retained earnings, opening balance € 40,299 € 41,538  
Dividends and other cash distributions 29 (4,377) (2,671) € (3,390)
Employee share-based compensation plans 45 34 27
Retained earings, closing balance 36,243 40,299 41,538
Retained earnings      
Disclosure of equity [Line Items]      
Retained earnings, opening balance 40,299 41,538 35,462
Transfer to/from other reserves 585 899 (8)
Result for the year 5,209 3,804 11,965
Dividends and other cash distributions 29 (4,124) (2,668) (3,349)
Employee share-based compensation plans 1 (7) 15
Share buybacks and other changes (5,728) (3,222) (1,984)
Retained earings, closing balance 36,243 40,299 41,538
Retained earnings | Impact IAS 29 on opening balance      
Disclosure of equity [Line Items]      
Retained earnings, opening balance (45) (563)
Retained earings, closing balance   € (45)