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REVENUE - Disaggregation of Revenue by Destination of Shipment (Details) - EUR (€) € in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disclosure of geographical areas [line items]
Total Revenue	€ 1,031	€ 1,538	€ 2,468	€ 3,074
France
Disclosure of geographical areas [line items]
Total Revenue	67	154	188	306
Germany
Disclosure of geographical areas [line items]
Total Revenue	192	339	479	678
United Kingdom
Disclosure of geographical areas [line items]
Total Revenue	39	49	108	99
Switzerland
Disclosure of geographical areas [line items]
Total Revenue	15	18	27	38
Other Europe
Disclosure of geographical areas [line items]
Total Revenue	201	286	476	555
United States
Disclosure of geographical areas [line items]
Total Revenue	413	600	974	1,164
United States
Disclosure of geographical areas [line items]
Total Revenue	7	9	24	27
Asia and Other Pacific
Disclosure of geographical areas [line items]
Total Revenue	61	68	118	137
All Other
Disclosure of geographical areas [line items]
Total Revenue	€ 36	€ 15	€ 74	€ 70

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2019-01-01
-Paragraph 113
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_113_a&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2019-01-01
-Paragraph 114
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_114&doctype=Standard
-URIDate 2019-03-27

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