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Note 18 Impairment test assumptions CGU goodwill in USA (Details) - UNITED STATES
Dec. 31, 2020
Dec. 31, 2019
Impairment test assumptions USA [Line Items]    
Discount rate applied to cash flow projections [1] 10.30% 10.00%
Growth rate used to extrapolate cash flow projections 3.00% 3.50%
[1] (*) After tax discount rates.