Post-employment benefits - Plan assets allocation (Detail) - Plan assets [Member] - EUR (€) € in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of post-employment benefits [Line items]
Liability asset of defined-benefit plans	€ 2,137	€ 3,095	€ 2,710
Assets quoted in active market [Member]
Disclosure of post-employment benefits [Line items]
Debt securities	1,142	1,085
Equity securities	69	91
Other	137	126
Assets not quoted in active market [Member]
Disclosure of post-employment benefits [Line items]
Debt securities	14	561
Equity securities	457	811
Other	€ 318	€ 421

The amount that instruments representing debt (rather than equity) constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The amount that instruments representing equity (rather than debt) constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

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The amount that other types of assets not separately disclosed constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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