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Commitments and Contingent Liabilities - Summary of Contingent Liabilities (Parenthetical) (Detail) - EUR (€) € in Millions	Dec. 31, 2018	Dec. 31, 2017
Brazil [member]
Disclosure of contingent liabilities [line items]
Corporate reorganisation tax assessment	€ 2,032	€ 2,092

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- Definition

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- Definition

Indirect tax relating to corporate reorganisation.

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