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BORROWINGS - Currency Concentration of Total Borrowings (Details) - EUR (€) € in Millions	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]
Total Borrowings	€ 2,257	€ 2,391	€ 2,361
U.S. Dollars
Disclosure of detailed information about borrowings [line items]
Total Borrowings	1,182	1,602
Euro
Disclosure of detailed information about borrowings [line items]
Total Borrowings	1,048	757
Other currencies
Disclosure of detailed information about borrowings [line items]
Total Borrowings	€ 27	€ 32

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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+ References

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