Financial income and expenses - Text details (Detail) - EUR (€) € in Millions	1 Months Ended	12 Months Ended
Jan. 31, 2017	Oct. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financial income and expenses [Abstract]
Net financial income and expense			€ (137)	€ (442)	€ (359)
Increase (decrease) in financial income expense			(305)
Increase (decrease) in net interest expense			(117)	(2)
Impairment loss on financial assets			2	24	46
Financial charges related to early redemption of bonds	€ 62	€ 91
Finance income			126	65	94
Interest income			€ 40	€ 43	€ 44

The amount of income associated with interest and other financing activities of the entity.

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The amount of income or cost associated with interest and other financing activities of the entity.

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The amount of impairment loss on financial assets. [Refer: Financial assets; Impairment loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of income arising from interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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