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Note 25 - Post-employment and other employee benefit commitments. Actuarial Assumptions (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Spain      
Disclosure Of Actuarial Assumptions Commitments Line Items      
Actuarial Assumption Of Discount Rates 1.28% 1.24% 1.50%
Actuarial Assumption Of Expected Rates Of Salary Increases 0.00% 0.00% 1.50%
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 PERM/F 2000P
Mexico [Member]      
Disclosure Of Actuarial Assumptions Commitments Line Items      
Actuarial Assumption Of Discount Rates 10.45% 9.48% 9.95%
Actuarial Assumption Of Expected Rates Of Salary Increases 4.75% 4.75% 4.75%
Actuarial Assumption Of Expected Rates Of Pension Increases 2.51% 2.13% 2.13%
Actuarial Assumption Of Medical Cost Trend Rates 7.00% 7.00% 6.75%
Mortality Table EMSSA09 EMSSA09 EMSSA97 (adjustment EMSSA09)
United States [Member]      
Disclosure Of Actuarial Assumptions Commitments Line Items      
Actuarial Assumption Of Discount Rates 4.23% 3.57% 4.04%
Actuarial Assumption Of Expected Rates Of Salary Increases 0.00% 0.00% 3.00%
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 RP 2014 RP 2014 RP 2014
Turkey [Member]      
Disclosure Of Actuarial Assumptions Commitments Line Items      
Actuarial Assumption Of Discount Rates 16.30% 11.60% 11.50%
Actuarial Assumption Of Expected Rates Of Salary Increases 14.00% 9.90% 9.30%
Actuarial Assumption Of Expected Rates Of Pension Increases 12.50% 8.40% 7.80%
Actuarial Assumption Of Medical Cost Trend Rates 16.70% 12.60% 10.92%
Mortality Table CSO2001 CSO2001 CSO2001