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Information on market risk and fair value of financial assets and liabilities (excluding Orange Bank) - Credit ratings (Details)
€ in Millions, $ in Billions
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Dec. 21, 2016
EUR (€)
Mar. 31, 2014
Bonds, financial liabilities [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Outstanding amount   € 30,893 € 27,070 € 25,703      
Bonds maturing March 1, 2031 [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Outstanding amount $ 2.5 € 2,200          
Interest rate (as a percent) 9.00% 9.00%         8.75%
Notional amount   € 2,500          
Credit facility [member]              
Disclosure of nature and extent of risks arising from financial instruments [line items]              
Notional amount   € 6,000     € 6,000 € 6,000