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Accounting Information and Policies - Additional Information (Detail)
€ in Millions
 12 Months Ended
Dec. 31, 2020
EUR (€)
Horlicks Brand [Member]  
Disclosure Of Summary Of Significant Accounting Policies [Line Items]  
Acquired brand value € 2,700
Hyperinflation restatement [member]  
Disclosure Of Summary Of Significant Accounting Policies [Line Items]  
Reduction in total assets 68
Reduction in turnover 58
Reduction in operating profit € 23