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Net finance costs - Summary of Net Finance Costs (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about finance income expense [Line Items]      
Finance costs € (501) € (672) € (821)
Bank loans and overdrafts (34) (32) (46)
Interest on bonds and other loans (402) (533) (617)
Interest on lease liabilities (72) (82) (100)
Net gain/(loss) on transactions for which hedge accounting is not applied 7 (25) (58)
Finance income 147 232 224
Pensions and similar obligations (10) (9) (30)
Net finance costs before non-underlying items (364) (449) (627)
Interest related to the UK tax audit of intangible income and centralised services 10 (56) 0
Net finance costs (354) (505) (627)
Unwinding of discount (19) (21)  
Brazil      
Disclosure of detailed information about finance income expense [Line Items]      
Interest on tax settlement 8 90  
India      
Disclosure of detailed information about finance income expense [Line Items]      
Interest on corporate income tax refund 7 27  
On foreign exchange derivatives      
Disclosure of detailed information about finance income expense [Line Items]      
Net gain/(loss) on transactions for which hedge accounting is not applied (68) 275 (321)
Exchange difference on underlying items      
Disclosure of detailed information about finance income expense [Line Items]      
Net gain/(loss) on transactions for which hedge accounting is not applied € 75 € (300) € 263