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Investment and Return - Schedule of Cash Resources and Other Financial Assets (Parenthetical) (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of financial assets [Abstract]
Assets in trust fund benefit obligations	€ 63	€ 79

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- References

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- Definition

Assets in trust fund benefit obligations.

+ References

No definition available.

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