Expenses by nature (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Expenses by nature
Personnel expenses	€ 7,845	€ 7,814	€ 3,738
Cost of material	7,776	7,260	2,907
Depreciation and amortization	1,591	1,594	286
Rental expenses	339	344	164
Impairment charges	210	17	11
Other	5,733	7,829	3,993
Total operating expenses	23,494	24,858	11,099
Government grant income and R&D tax credits	140	126	20
Income from government grants	€ 2	€ 11	€ 4

The amount of depreciation and amortisation expense. Depreciation and amortisation are the systematic allocations of depreciable amounts of assets over their useful lives.

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The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment.

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The amount of expenses aggregated according to their nature (for example, depreciation, purchases of materials, transport costs, employee benefits and advertising costs), and not reallocated among functions within the entity.

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The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]]

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The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature]

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The amount of raw materials and consumables used in the production process or in the rendering of services. [Refer: Current raw materials]

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The amount of expense recognised on rental activities.

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The amount of income recognised in relation to government grants. [Refer: Government grants]

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Represents the amount of government grant income and research and development tax credits.

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