Equity - Share capital transactions (Detail) - EUR (€) € / shares in Units, € in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity [Line items]
Purchase of treasury shares	€ (318)	€ (589)	€ (507)
Treasury shares transactions [Member]
Equity [Line items]
Shares acquired	4,618,933	16,591,985	20,296,016
Average market price	€ 32.47	€ 23.84	€ 24.39
Purchase of treasury shares	€ 150	€ 396	€ 495
Reduction of treasury shares		18,829,985	21,361,016
Cancellation of treasury shares		€ 450	€ 517
Number of treasury shares	4,618,933		2,238,000
Total cost	€ 150		€ 55

The amount of treasury stock cancelled during the period. [Refer: Treasury shares]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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- Definition

The decrease in equity resulting from the purchase of treasury shares. [Refer: Treasury shares]

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- Definition

The number of shares in the entity held by the entity or by its subsidiaries or associates. [Refer: Associates [member]; Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_vi&doctype=Standard
-URIDate 2017-03-09

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