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Share-Based Payments - Summary of Weighted Average Exercise Price of Options (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Brazil [Member] | Ambev [member]      
Disclosure of options weighted average exercise price [line items]      
Options outstanding at 1 January $ 3.81 $ 4.60 $ 4.17
Granted during the year   3.47 4.48
Exercised during the year 2.36 1.60 2.25
Forfeited during the year 4.53 4.42 5.27
Outstanding at the end of December 3.57 3.81 4.60
Exercisable at the end of December 3.79 4.56 4.74
AB inBev [member]      
Disclosure of options weighted average exercise price [line items]      
Options outstanding at 1 January 71.22 79.66 94.74
Granted during the year   53.41 83.33
Exercised during the year 46.30 29.92 29.27
Forfeited during the year 89.56 117.82 108.44
Outstanding at the end of December 64.77 71.22 79.66
Exercisable at the end of December $ 98.27 $ 99.54 $ 65.33