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Share Buyback Programme - Additional Information (Detail) - EUR (€)		6 Months Ended
	Apr. 19, 2018	Jun. 30, 2018
Equity [abstract]
Share buyback programme amount	€ 6,000,000,000
Number of shares repurchased		53,040,783
Shares repurchased amount		€ 2,514,000,000
Cash consideration		2,246,000,000
Unpaid consideration		€ 268,000,000

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Consideration for share buy back programme.

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Consideration paid for share buy back programme.

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Maximum value for announced share buyback programme.

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Number of treasury shares repurchased.

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UnPaid consideration included within current financial liabilities.

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