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Gains and losses on disposal and main changes in scope of consolidation - Net tax gain associated with the loss of control in the FiberCo (Details) - EUR (€)
€ in Millions
Aug. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about business combination [line items]        
Reameasurement at fair value of remaining interests held   € 1,486 € 1,440 € 98
FiberCo        
Disclosure of detailed information about business combination [line items]        
Sales price € 292      
Reameasurement at fair value of remaining interests held 292      
Fair value at the disposal date 584      
Net book value and transaction costs related to sale (244)      
Gain resulting from the loss of control on the FiberCo 340      
Tax cost related to sale of the shares 30      
Net gain resulting from the loss of exclusive control € 310      
Percentage of equity interest sold 50.00%