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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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