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Note 6 - Operating Segment Reporting - Total Assets Operating Segment (Details) - EUR (€) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Total Assets Line Items |  |  |
Assets | € 736,176,000,000 | € 697,737,000,000 | € 675,675,000,000
Spain [Member] |  |  |
Total Assets Line Items |  |  |
Assets | 405,878,000,000 | 364,427,000,000 | 353,923,000,000
United States [Member] |  |  |
Total Assets Line Items |  |  |
Assets | 93,953,000,000 | 88,529,000,000 | 82,057,000,000
Mexico [Member] |  |  |
Total Assets Line Items |  |  |
Assets | 110,224,000,000 | 109,079,000,000 | 97,432,000,000
Turkey [Member] |  |  |
Total Assets Line Items |  |  |
Assets | 59,585,000,000 | 64,416,000,000 | 66,250,000,000
South America [Member] |  |  |
Total Assets Line Items |  |  |
Assets | 55,435,000,000 | 54,996,000,000 | 54,373,000,000
Rest Of Eurasia [Member] |  |  |
Total Assets Line Items |  |  |
Assets | 22,881,000,000 | 23,257,000,000 | 18,845,000,000
Subtotal [Member] |  |  |
Total Assets Line Items |  |  |
Assets | 747,957,000,000 | 704,703,000,000 | 672,880,000,000
Corporate Center and other adjustments [Member] |  |  |
Total Assets Line Items |  |  |
Assets | € (11,781,000,000) | € (6,967,000,000) | € 2,796,000,000

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