Goodwill - Summary (Details) - Goodwill - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Changes in goodwill and intangible assets
Intangible assets at beginning of period	€ 31,088
Intangible assets at end of period	33,106	€ 31,088
Historical cost
Changes in goodwill and intangible assets
Intangible assets at beginning of period	31,190	27,636
Foreign currency exchange differences	1,526	1,838
Additions from business combinations	589	1,736
Retirements/disposals	(95)	(20)
Intangible assets at end of period	33,210	31,190
Accumulated amortization
Changes in goodwill and intangible assets
Intangible assets at beginning of period	(102)	(99)
Foreign currency exchange differences	2	3
Intangible assets at end of period	€ (104)	€ (102)

The increase in intangible assets and goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets and goodwill]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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The decrease in intangible assets and goodwill resulting from disposals and retirements. [Refer: Intangible assets and goodwill]

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The increase (decrease) in intangible assets and goodwill resulting from the net exchange differences arising when the financial statements are translated 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: Intangible assets and goodwill]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill]

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