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Inventories - Additional Information (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Classes of current inventories [abstract]
Inventories carried at net realisable value	€ 204	€ 159
Total expense towards inventory write downs and losses	€ 381	€ 363

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- Definition

The amount of inventories carried at net realisable value. [Refer: Inventories]

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- Definition

The amount of expense recognised related to the write-down of inventories to net realisable value. [Refer: Inventories]

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