Impairment losses and goodwill - Key assumptions used to determine recoverable amounts - Additional information (Details)	12 Months Ended
Dec. 31, 2019
Goodwill [abstract]
Threshold percentage of aggregated share of groups listed subsidiaries on consolidated revenues (as a percent)	20.00%
Threshold percentage of aggregated share of groups listed subsidiaries on consolidated operating income (as a percent)	20.00%
Threshold percentage of aggregated share of groups listed subsidiaries on consolidated net income (as a percent)	20.00%

Threshold percentage of aggregated share of groups listed subsidiaries on consolidated operating income

No definition available.

Name:	oran_ThresholdPercentageOfAggregatedShareOfGroupsListedSubsidiariesOnConsolidatedOperatingIncome
Namespace Prefix:	oran_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration