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Note 21 Condensed statements of cash flows of companies held for sale in the USA subsidiary (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed statements of cash flows of companies held for sale in the USA subsidiary [Line Items]      
Effect of exchange rate changes on cash and cash equivalents € (1,864) € (4,658) € (634)
Sold USA subsidiary [Member]      
Condensed statements of cash flows of companies held for sale in the USA subsidiary [Line Items]      
Cash flows from (used in) operating activities, continuing operations 62 [1] 6,874 3,888
Cash flows from (used in) investing activities, continuing operations (34) [1] (145) (133)
Cash flows from (used in) financing activities, continuing operations (26) [1] (65) (468)
Effect of exchange rate changes on cash and cash equivalents 60 [1] (974) 65
Increase (decrease) in cash and cash equivalents € 62 [1] € 5,690 € 3,352
[1] (*) Corresponds to the first five months of 2021 (See Notes 1.3 and 3).