Employee benefits - Net defined benefit obligations - Reconciliation (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in net defined benefit liability (asset) [abstract]
Net interest on the defined benefit liability	€ 20	€ 16	€ 21
Actuarial losses/(gains) arising from changes of assumptions	(109)	45	16
Present value of defined benefit obligation [member]
Changes in net defined benefit liability (asset) [abstract]
Total-opening balance	3,837	3,727	4,009
Service cost	146	786	154
Net interest on the defined benefit liability	27	23	29
Actuarial losses/(gains) arising from changes of assumptions	82	(34)	67
Actuarial losses/(gains) arising from experience	5	78	212
Benefits paid	(687)	(746)	(738)
Other	20	3	(6)
Total-closing balance	3,430	3,837	3,727
Present value of defined benefit obligation [member] \| Actuarial assumption of discount rates [member]
Changes in net defined benefit liability (asset) [abstract]
Actuarial losses/(gains) arising from changes of assumptions	182	(38)	€ 37
Annuity-based defined benefit plans [member] \| Present value of defined benefit obligation [member]
Changes in net defined benefit liability (asset) [abstract]
Total-opening balance	502
Service cost	1
Net interest on the defined benefit liability	9
Actuarial losses/(gains) arising from changes of assumptions	32
Actuarial losses/(gains) arising from experience	5
Benefits paid	(21)
Other	15
Total-closing balance	543	502
Annuity-based defined benefit plans [member] \| Present value of defined benefit obligation [member] \| Actuarial assumption of discount rates [member]
Changes in net defined benefit liability (asset) [abstract]
Actuarial losses/(gains) arising from changes of assumptions	53
Capital-based defined benefit plans [member] \| Present value of defined benefit obligation [member]
Changes in net defined benefit liability (asset) [abstract]
Total-opening balance	833
Service cost	48
Net interest on the defined benefit liability	17
Actuarial losses/(gains) arising from changes of assumptions	122
Actuarial losses/(gains) arising from experience	28
Benefits paid	(41)
Other	(4)
Total-closing balance	1,003	833
Capital-based defined benefit plans [member] \| Present value of defined benefit obligation [member] \| Actuarial assumption of discount rates [member]
Changes in net defined benefit liability (asset) [abstract]
Actuarial losses/(gains) arising from changes of assumptions	120
Other post-employment benefits [member] \| Present value of defined benefit obligation [member]
Changes in net defined benefit liability (asset) [abstract]
Total-opening balance	68
Service cost	1
Net interest on the defined benefit liability	1
Actuarial losses/(gains) arising from changes of assumptions	(52)
Actuarial losses/(gains) arising from experience	1
Benefits paid	(3)
Other	1
Total-closing balance	17	68
Other post-employment benefits [member] \| Present value of defined benefit obligation [member] \| Actuarial assumption of discount rates [member]
Changes in net defined benefit liability (asset) [abstract]
Actuarial losses/(gains) arising from changes of assumptions	2
French part-time for seniors plans [member] \| Present value of defined benefit obligation [member]
Changes in net defined benefit liability (asset) [abstract]
Total-opening balance	1,784
Service cost	45
Net interest on the defined benefit liability	(1)
Actuarial losses/(gains) arising from changes of assumptions	(22)
Actuarial losses/(gains) arising from experience	(29)
Benefits paid	(545)
Other	1
Total-closing balance	1,233	1,784
French part-time for seniors plans [member] \| Present value of defined benefit obligation [member] \| Actuarial assumption of discount rates [member]
Changes in net defined benefit liability (asset) [abstract]
Actuarial losses/(gains) arising from changes of assumptions	5
Other long-term benefits [member] \| Present value of defined benefit obligation [member]
Changes in net defined benefit liability (asset) [abstract]
Total-opening balance	650
Service cost	51
Net interest on the defined benefit liability	1
Actuarial losses/(gains) arising from changes of assumptions	2
Benefits paid	(77)
Other	7
Total-closing balance	634	€ 650
Other long-term benefits [member] \| Present value of defined benefit obligation [member] \| Actuarial assumption of discount rates [member]
Changes in net defined benefit liability (asset) [abstract]
Actuarial losses/(gains) arising from changes of assumptions	€ 2

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 141
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_c_ii&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 141
-Subparagraph c
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_c_iii&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	ifrs-full_ChangesInNetDefinedBenefitLiabilityAssetAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 141
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_a&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_CurrentServiceCostNetDefinedBenefitLiabilityAsset
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 141
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_IncreaseDecreaseThroughOtherChangesNetDefinedBenefitLiabilityAsset
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 141
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_b&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_InterestExpenseIncomeNetDefinedBenefitLiabilityAsset
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 140
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_140_a&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_LiabilityAssetOfDefinedBenefitPlans
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 141
-Subparagraph g
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_g&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_PaymentsFromPlanNetDefinedBenefitLiabilityAsset
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	ifrs-full_NetDefinedBenefitLiabilityAssetAxis=ifrs-full_PresentValueOfDefinedBenefitObligationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=ifrs-full_ActuarialAssumptionOfDiscountRatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_DefinedBenefitPlansAxis=oran_AnnuityBasedDefinedBenefitPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_DefinedBenefitPlansAxis=oran_CapitalBasedDefinedBenefitPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_DefinedBenefitPlansAxis=oran_OtherPostEmploymentBenefitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_DefinedBenefitPlansAxis=oran_FrenchPartTimeForSeniorsPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_DefinedBenefitPlansAxis=oran_OtherLongTermBenefitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: