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Share-based compensation - Summary of Impact of Changes on Stock Options Expense for Options Granted (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Share Based Payments [Line Items]
Share-based compensation	€ 223	€ 176	€ 122
Volatility decreased by 10%
Stock option expense increase/(decrease) under the following    assumption changes
Volatility increase (decrease) by 10%	(13)
Volatility increase by 10%
Stock option expense increase/(decrease) under the following    assumption changes
Volatility increase (decrease) by 10%	16
Expected life decrease by 1 year
Stock option expense increase/(decrease) under the following    assumption changes
Expected life increase (decrease) by 1 year	(8)
Expected life increase by 1 year
Stock option expense increase/(decrease) under the following    assumption changes
Expected life increase (decrease) by 1 year	9
Options Granted in 2020
Disclosure Of Share Based Payments [Line Items]
Share-based compensation	€ 56

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The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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