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Note 17 - Intangible assets Sensitivity analysis (Details)
Mar. 31, 2020
EUR (€)
United States [Member] | Impact Of An Increase 50 Percent Basis Point [Member] | Discount Rate [Member]  
Disclosure of sensitivity analysis for main assumptions Line Items  
Discount rates applied to cash flow projections percentage € (755,000,000) [1]
United States [Member] | Impact Of An Increase 50 Percent Basis Point [Member] | Sustainable Growth Rate [Member]  
Disclosure of sensitivity analysis for main assumptions Line Items  
Discount rates applied to cash flow projections percentage 270,000,000 [1]
United States [Member] | Impact Of A Decrease 50 Percent Basis Point [Member] | Discount Rate [Member]  
Disclosure of sensitivity analysis for main assumptions Line Items  
Discount rates applied to cash flow projections percentage 869,000,000 [1]
United States [Member] | Impact Of A Decrease 50 Percent Basis Point [Member] | Sustainable Growth Rate [Member]  
Disclosure of sensitivity analysis for main assumptions Line Items  
Discount rates applied to cash flow projections percentage (235,000,000) [1]
Turkey [Member] | Impact Of An Increase 50 Percent Basis Point [Member] | Discount Rate [Member]  
Disclosure of sensitivity analysis for main assumptions Line Items  
Discount rates applied to cash flow projections percentage (166,000,000)
Turkey [Member] | Impact Of An Increase 50 Percent Basis Point [Member] | Sustainable Growth Rate [Member]  
Disclosure of sensitivity analysis for main assumptions Line Items  
Discount rates applied to cash flow projections percentage 23,000,000
Turkey [Member] | Impact Of A Decrease 50 Percent Basis Point [Member] | Discount Rate [Member]  
Disclosure of sensitivity analysis for main assumptions Line Items  
Discount rates applied to cash flow projections percentage 183,000,000
Turkey [Member] | Impact Of A Decrease 50 Percent Basis Point [Member] | Sustainable Growth Rate [Member]  
Disclosure of sensitivity analysis for main assumptions Line Items  
Discount rates applied to cash flow projections percentage € (21,000,000)
[1]

(*) Based on historical changes, the use of 50 basis points to calculate the sensitivity analysis would be a reasonable variation with respect to the observed variations over the last five years .