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Financial Instruments - Summary of Cash Resources and Other Financial Assets (Parenthetical) (Detail) - EUR (€) € in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Disclosure of Detailed Information about Financial Instruments [Line Items]
Term of short term deposits assets	3 months
Equity investments non current at fair value through other comprehensive income	€ 408	€ 356	€ 284
Non Current Financial Assets At Amortised Cost [Member] | Judicial Deposits [Member]
Disclosure of Detailed Information about Financial Instruments [Line Items]
Investments in judicial deposits non current	€ 107	€ 101	€ 94

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- 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.

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- Definition

The amount of long-term deposits held by the entity.

+ References

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

The amount of non-current investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Investments in equity instruments designated at fair value through other comprehensive income]

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Term of short term deposits assets.

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