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Note 25 - Post-employment and other employee benefit commitments. Sensitivity Analysis (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sensitivity Analysis Line Items      
Other long term employee benefits € 49,000,000 € 61,000,000 € 62,000,000
Discount Rate [Member]      
Sensitivity Analysis Line Items      
Increase (354,000,000) (367,000,000) (298,000,000)
Increase in Defined Benefit 390,000,000 405,000,000 332,000,000
rate of salary increasy [Member]      
Sensitivity Analysis Line Items      
Increase 4,000,000 3,000,000 3,000,000
Increase in Defined Benefit (4,000,000) (3,000,000) (3,000,000)
rate of pension increase [Member]      
Sensitivity Analysis Line Items      
Increase 29,000,000 27,000,000 19,000,000
Increase in Defined Benefit (27,000,000) (26,000,000) (18,000,000)
medical cost trend rate [Member]      
Sensitivity Analysis Line Items      
Increase 145,000,000 169,000,000 115,000,000
Increase in Defined Benefit (129,000,000) (133,000,000) (91,000,000)
change in obligation from each additional year of longevity [Member]      
Sensitivity Analysis Line Items      
Increase 211,000,000 137,000,000 108,000,000
Increase in Defined Benefit € 0 € 0 € 0