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Note 16 Joint ventures and associates changes in the year (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Joint ventures and associates changes in the year [Line Items]        
Investments in subsidiaries, joint ventures and associates € 900 € 1,437 € 1,488 € 1,578
Acquisitions and capital increases 22 257 161  
Disposals and capital reductions (1) (47) (149)  
Transfers and changes of consolidation Method (559) (7) (27)  
Share of profit and loss 1 (39) (42)  
Exchange differences 9 (27) 10  
Dividends valuation adjustments and others € (9) € (188) € (43)