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Provisions - Additional Information (Detail) € in Millions	12 Months Ended
	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 EUR (€)
Disclosure of Other Provisions [Line Items]
Total provisions for 2017 and 2016	€ 1,319	€ 1,423
Number of cases	31
Releases	€ 191
Utilisation	414
Disputed indirect taxes [Member]
Disclosure of Other Provisions [Line Items]
Reduction in the provision for disputed indirect taxes	261
Releases	68
Utilisation	193
Investigations Proceedings Provision [Member]
Disclosure of Other Provisions [Line Items]
Total provisions for 2017 and 2016	€ 80

X

- Definition

The increase (decrease) in other provisions. [Refer: Other provisions]

+ References

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- Definition

The amount of provisions other than provisions for employee benefits. [Refer: Provisions]

+ References

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- Definition

The amount used (ie incurrent and charged against the provision) for other provisions. [Refer: Other provisions]

+ References

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- Definition

The amount reversed for unused other provisions. [Refer: Other provisions]

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Number of cases.

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