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Note 25 - Post-employment and other employee benefit commitments. Actuarial Assumptions (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Spain [Member]      
Disclosure Of Actuarial Assumptions Commitments Line Items      
Actuarial Assumption Of Discount Rates 0.53% 0.68% 1280000.00%
Actuarial Assumption Of Expected Rates Of Salary Increases 0.00% 0.00% 0.00%
Actuarial Assumption Of Expected Rates Of Pension Increases 0.00% 0.00% 0.00%
Actuarial Assumption Of Medical Cost Trend Rates 0.00% 0.00% 0.00%
Mortality Table PERM/F 2000P PERM/F 2000P PER 2020
Mexico [Member]      
Disclosure Of Actuarial Assumptions Commitments Line Items      
Actuarial Assumption Of Discount Rates 8.37% 9.04% 10450000.00%
Actuarial Assumption Of Expected Rates Of Salary Increases 4.00% 4.75% 4750000.00%
Actuarial Assumption Of Expected Rates Of Pension Increases 1.94% 2.47% 2510000.00%
Actuarial Assumption Of Medical Cost Trend Rates 7.00% 7.00% 7000000.00%
Mortality Table EMSSA09 EMSSA09 EMSSA09
United States [Member]      
Disclosure Of Actuarial Assumptions Commitments Line Items      
Actuarial Assumption Of Discount Rates   3.24% 4230000.00%
Actuarial Assumption Of Expected Rates Of Salary Increases   0.00% 0.00%
Actuarial Assumption Of Expected Rates Of Pension Increases   0.00% 0.00%
Actuarial Assumption Of Medical Cost Trend Rates   0.00% 0.00%
Mortality Table RP 2014 RP 2014  
Turkey [Member]      
Disclosure Of Actuarial Assumptions Commitments Line Items      
Actuarial Assumption Of Discount Rates 13.00% 12.50% 16300000.00%
Actuarial Assumption Of Expected Rates Of Salary Increases 11.20% 9.70% 14000000.00%
Actuarial Assumption Of Expected Rates Of Pension Increases 9.70% 8.20% 12500000.00%
Actuarial Assumption Of Medical Cost Trend Rates 13.90% 12.40% 16700000.00%
Mortality Table CSO2001 CSO2001 CSO2001