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Reinsurance Assets - Additional Information (Detail) - EUR (€) € in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Amounts Arising From Re Insurance Contracts [abstract]
Reinsurance assets, current	€ 13	€ 12

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Disclosure Of Amounts Arising From Re Insurance Contracts [abstract].

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- Definition

Reinsurance assets, current.

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