Impairment losses and goodwill - Goodwill - Reconciliation (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in goodwill [abstract]
Opening balance	€ 27,174	€ 26,911
Impairment of goodwill	(54)	(56)	€ (20)
Closing balance	27,644	27,174	26,911
Gross carrying amount [member]
Changes in goodwill [abstract]
Opening balance	32,949	32,687	32,689
Acquisitions	520	353	38
Disposals	(4)	(12)	0
Translation adjustment	111	(39)	(40)
Reclassifications and other items	3	(40)	0
Reclassification to assets held for sale	0	0	0
Closing balance	33,579	32,949	32,687
Accumulated impairment [member]
Changes in goodwill [abstract]
Opening balance	(5,775)	(5,776)	(5,710)
Impairment of goodwill	(54)	(56)	(20)
Disposals	4	12	0
Translation adjustment	(110)	45	(46)
Reclassifications and other items	0	0	0
Reclassification to assets held for sale	0	0	0
Closing balance	€ (5,935)	€ (5,775)	€ (5,776)

The amount of additional goodwill recognised, except goodwill included in a disposal group that, on acquisition, meets the criteria to be classified as held for sale in accordance with IFRS 5. [Refer: Goodwill; Disposal groups classified as held for sale [member]]

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The decrease in goodwill due to classification as held for sale. [Refer: Goodwill; Disposal groups classified as held for sale [member]]

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The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

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The amount of goodwill derecognised without having previously been included in a disposal group classified as held for sale. [Refer: Goodwill; Disposal groups classified as held for sale [member]]

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The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]

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The increase (decrease) in goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Goodwill]

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Reclassification and other items, goodwill

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