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Other non-current assets - Movements in Interest in Joint Ventures and Associates (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Joint Ventures And Associates [Line Items]    
Other non current assets, beginning balance € 931  
Other non current assets, ending balance 974 € 931
Associates    
Disclosure Of Joint Ventures And Associates [Line Items]    
Other non current assets, beginning balance 34 37
Additions 7 1
Dividend received/reductions (32) 0
Share of net profit/(loss) 15 (2)
Currency retranslation (1) (2)
Other non current assets, ending balance 23 34
Joint ventures    
Disclosure Of Joint Ventures And Associates [Line Items]    
Other non current assets, beginning balance 29 35
Additions 2 1
Dividends received/reductions (171) (182)
Share of net profit/(loss) 176 177
Currency retranslation 1 (2)
Other non current assets, ending balance € 37 € 29