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Investment income - Summary of investment income (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investment income [abstract]      
Dividend income € 105 € 149 € 122
Realised gains/losses on disposal of debt instruments measured at FVOCI (11) 32 45
Income from and fair value gains/losses on investment properties (1)
Investment income € 95 € 181 € 167