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EMPLOYEE BENEFIT EXPENSES (Tables)
12 Months Ended
Dec. 31, 2020
Classes of employee benefits expense [abstract]  
Schedule of Total Employee Benefit Expenses
Year ended December 31,
(in millions of Euros)Notes202020192018
Wages and salaries(855)(994)(889)
Pension costs - defined benefit plans23(23)(19)(20)
Other post-employment benefits23(9)(9)(6)
Share-based compensation30(15)(16)(12)
Total employee benefit expenses(902)(1,038)(927)