Activities of Orange Bank - Fair value of derivatives, net (Details) - Derivatives [member] - Orange Bank, operating segment [member] - Operating segments [member] - EUR (€) € in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Derivatives, net amount, fair value	€ (46)	€ (60)
Level 2 of fair value hierarchy [member]
Disclosure of detailed information about financial instruments [line items]
Derivatives, net amount, fair value	(29)	(73)
Level 3 of fair value hierarchy [member]
Disclosure of detailed information about financial instruments [line items]
Derivatives, net amount, fair value	€ (17)	€ 13