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REVENUE - Disaggregation of Revenue by Product Line (Details) - EUR (€) € in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disclosure of products and services [line items]
Total Revenue	€ 1,795	€ 1,950	€ 3,526	€ 3,906
Packaging rolled products
Disclosure of products and services [line items]
Total Revenue	677	699	1,295	1,384
Automotive rolled products
Disclosure of products and services [line items]
Total Revenue	296	312	583	616
Specialty and other thin-rolled products
Disclosure of products and services [line items]
Total Revenue	26	34	55	70
Aerospace rolled products
Disclosure of products and services [line items]
Total Revenue	244	271	507	524
Transportation, industry, defense and other rolled products
Disclosure of products and services [line items]
Total Revenue	195	190	363	385
Automotive extruded products
Disclosure of products and services [line items]
Total Revenue	233	251	475	511
Other extruded products
Disclosure of products and services [line items]
Total Revenue	123	193	245	416
Other metal sales
Disclosure of products and services [line items]
Total Revenue	€ 2	€ 0	€ 3	€ 0

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with 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 2023-01-01
-Paragraph 114
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_114&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2023-01-01
-Paragraph 113
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_113_a&doctype=Standard
-URIDate 2023-03-23

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