Revenue and Expenses - Depreciation and Amortization (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Analysis of income and expense [abstract]
Property, plant and equipment (Note 8)	€ 4,055	€ 4,133	€ 4,360
Intangible assets (Note 6)	2,583	2,599	2,388
Rights of use (Note 9)	2,159	2,064	1,649
Total	€ 8,797	€ 8,796	€ 8,397

The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill]

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets]

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