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Note 16 Joint ventures and associates changes in the year (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Joint ventures and associates changes in the year [Line Items]        
Investments in subsidiaries, joint ventures and associates € 916 € 900 € 1,437 € 1,488
Acquisitions and capital increases 87 22 257  
Disposals and capital reductions (88) (1) (47)  
Transfers and changes of consolidation Method 0 (559) (7)  
Share of profit and loss 20 1 (39)  
Exchange differences (1) 9 (27)  
Dividends valuation adjustments and others € (2) € (9) € (188)