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Operating costs and non-underlying items - Analysis of expenses recognized in Profit or loss by function (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Analysis of expenses recognized in profit or loss by function [Line Items]      
Turnover € 50,724 € 51,980 € 50,982
Cost of sales (28,684) (29,102) (28,703)
Gross profit 22,040 22,878 22,279
Selling and administrative expenses (12,673) (12,931) (12,816)
Non-underlying items within operating profit before tax (1,064) (1,239) 3,176
Operating profit 8,303 8,708 12,639
Cost of Sales [Member]      
Analysis of expenses recognized in profit or loss by function [Line Items]      
Distribution costs (3,104) (3,089) (3,057)
Production costs (3,696) (3,701) (3,732)
Raw and packaging materials and goods purchased for resale (20,400) (20,769) (20,516)
Other (1,484) (1,543) (1,398)
Selling and Administrative Expenses [Member]      
Analysis of expenses recognized in profit or loss by function [Line Items]      
Brand and marketing investment (7,091) (7,272) (7,150)
Overheads (5,582) (5,659) (5,666)
Research and development € (800) € (840) € (900)