Purchases and other expenses - Prepaid expenses - Reconciliation (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Purchases and other expenses [abstract]
Prepaid expenses in the opening balance	€ 571	€ 455	€ 394
Business related variations	127	93	78
Changes in the scope of consolidation	65	6
Translation adjustment	5		(17)
Reclassifications and other items	(38)	17	0
Reclassification to assets held for sale	0	0	0
Prepaid expenses in the closing balance	€ 730	€ 571	€ 455

The amount recognised as a current asset for expenditures made prior to the period when the economic benefit will be realised.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2019-03-27

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Balance Type:	debit
Period Type:	instant

- Definition

The amount of business related variations on current prepaid expenses.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The amount of changes in the scope of consolidation on current prepaid expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	oran_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of reclassification to asset held for sale on current prepaid expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	oran_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of reclassifications and other items on current prepaid expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	oran_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of translation adjustment on current prepaid expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	oran_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Purchases and other expenses [abstract]

+ References

No definition available.

+ Details

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Period Type:	duration