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Note 16 Joint ventures and associates changes in the year (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Joint ventures and associates changes in the year [Line Items]      
Investments in subsidiaries, joint ventures and associates reported in separate financial statements € 976 € 916 € 900
Acquisitions and capital increases 4 95 87
Disposals and capital reductions (28) (42) (88)
Transfers and changes of consolidation Method (69) 4 0
Share of profit and loss 40 26 21
Exchange differences 7 16 (1)
Valuation adjustments [1] 63 (9) 42
Dividends valuation adjustments and others (5) (30) (44)
Investments in subsidiaries, joint ventures and associates reported in separate financial statements € 989 € 976 € 916
[1]
(1) See Note 16.3.