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Share-Based Payments - Summary of Number of Options Outstanding (Detail)
shares in Millions, Unit_pure in Millions
 12 Months Ended
Dec. 31, 2021
shares
Dec. 31, 2020
Dec. 31, 2019
Disclosure of information about options outstanding [line items]      
Options outstanding at the end of December 113.8    
Brazil [Member] | Ambev [member]      
Disclosure of information about options outstanding [line items]      
Options outstanding at 1 January 127.3 141.8 141.3
Options issued during the year     24.6
Options exercised during the year (5.2) (5.7) (7.8)
Options forfeited during the year (8.3) (8.8) (16.3)
Options outstanding at the end of December 113.8 127.3 141.8
AB inBev [member]      
Disclosure of information about options outstanding [line items]      
Options outstanding at 1 January 113.3 88.7 92.6
Options issued during the year   38.1 13.8
Options exercised during the year (1.3) (3.9) (10.7)
Options forfeited during the year (9.2) (9.0) (7.0)
Options outstanding at the end of December 102.7 113.3 88.7