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Accounting information and policies - Narrative (Details)
€ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2022
EUR (€)
business_group
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
division
Dec. 31, 2021
cash_generating_unit
Dec. 31, 2021
divisions
Nov. 29, 2020
Company
Nov. 28, 2020
Company
Disclosure Of Summary Of Significant Accounting Policies [Line Items]              
Number of parent companies | Company           1 2
Number of business groups | business_group 5            
Number of cash generating units | cash_generating_unit       11      
Number of divisions included in cash generating units     3   3    
Revenue contribution by Russian business, percentage   1.40%          
Net profit contribution by Russian business, percentage   2.00%          
Russia              
Disclosure Of Summary Of Significant Accounting Policies [Line Items]              
Assets (liabilities) | € € 900 € 900