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Equity - Schedule of changes in share of associates, joint ventures and other reserves (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of equity [Line Items]      
Opening balance € (2,192) € (540)  
Closing balance (2,767) (2,192) € (540)
Share of associates, joint ventures and other reserves      
Disclosure of equity [Line Items]      
Opening balance 3,603 3,416 3,246
Result for the year 336 161 191
Transfer to/from retained earnings (892) 26 (21)
Closing balance € 3,047 € 3,603 € 3,416