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Investment in associates and joint ventures - Summary of changes in investments in associates and joint ventures (Details) - EUR (€)
€ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Disclosure of investments in associates and joint ventures [Line items]      
Opening balance as at 1 January € 1,509    
Share of results 43 € 38  
Closing balance 1,459   € 1,509
Associates and joint ventures      
Disclosure of investments in associates and joint ventures [Line items]      
Opening balance as at 1 January 1,509 € 1,500 1,500
Additions 22   55
Transfers (10)  
Revaluations 4   4
Share of results 43   149
Dividends received (39)   (74)
Disposals (5)   (89)
Impairments (24)   (5)
Exchange rate differences (41)   (32)
Closing balance € 1,459   € 1,509