Revenue and Expenses - Depreciation and Amortization (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Analysis of income and expense [abstract]
Depreciation of property, plant and equipment (Note 8)	€ 5,953	€ 5,951	€ 6,071
Amortization of intangible assets (Note 6)	3,443	3,698	3,633
Total	€ 9,396	€ 9,649	€ 9,704

The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives.

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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 amount of depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible assets over their useful lives.

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