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Share Buyback Programme - Additional Information (Detail) - EUR (€) € in Millions, shares in Millions		12 Months Ended
	Nov. 06, 2017	Dec. 31, 2017
Equity [Abstract]
Share buyback programme amount	€ 5,000
Number of shares repurchased		101,942,383
Cash consideration		€ 5,014

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- Definition

Consideration paid for share buy back programme.

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Number of treasury shares repurchased.

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Value for announced share buyback programme.

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