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Note 25 - Post-employment and other employee benefit commitments - Actuarial Assumptions (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Actuarial assumptions of commitments Line Items      
Discount rate shown as the end of the exercise In Spain, the discount rate shown as of December, 31, 2017, corresponds to the weighted average rate, the actual discount rates used are 0.50% and 1.75% depending on the type of commitment.    
Spain [Member]      
Actuarial assumptions of commitments Line Items      
Actuarial assumptions of commitments 1.24% 1.50% 2.00%
Actuarial Assumption Of Expected Rates Of Salary Increases 0.00% 1.50% 2.00%
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 PERM/F 2000P
Mexico [Member]      
Actuarial assumptions of commitments Line Items      
Actuarial assumptions of commitments 9.48% 9.95% 9.30%
Actuarial Assumption Of Expected Rates Of Salary Increases 4.75% 4.75% 4.75%
Actuarial Assumption Of Expected Rates Of Pension Increases 2.13% 2.13% 2.13%
Actuarial Assumption Of Medical Cost Trend Rates 7.00% 6.75% 6.75%
Mortality Table EMSSA09 EMSSA97 (adjustment EMSSA09) EMSSA 97
USA [Member]      
Actuarial assumptions of commitments Line Items      
Actuarial assumptions of commitments 3.57% 4.04% 4.30%
Actuarial Assumption Of Expected Rates Of Salary Increases 0.00% 3.00% 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]      
Actuarial assumptions of commitments Line Items      
Actuarial assumptions of commitments 11.60% 11.50% 10.30%
Actuarial Assumption Of Expected Rates Of Salary Increases 9.90% 9.30% 8.60%
Actuarial Assumption Of Expected Rates Of Pension Increases 8.40% 7.80% 7.10%
Actuarial Assumption Of Medical Cost Trend Rates 12.60% 10.92% 9.94%
Mortality Table CSO2001 CSO2001 CSO2001