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Note 18 - Intangible assets Sensitivity analysis (Details)
€ in Millions
Dec. 31, 2018
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 € (1,009) [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 526 [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 1,176 [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 (451) [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 (149) [2]
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 40 [2]
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 158 [2]
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 € (37) [2]
[1]

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

[2]

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