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Other assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Miscellaneous assets [abstract]      
Transactions in transit € 246 € 83 € 157
Net pension plan assets (note 25) 1,001 1,345 1,990
Prepayments and accrued income 2,911 3,003 2,610
Other (note 2.m) 4,598 5,536 3,683
Other non-financial assets € 8,756 € 9,967 € 8,440