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Share-Based Payments - Summary of Number of Outstanding Deferred and Restricted stock Units (Detail) - Restricted Stock Units And Performance Stock Units [Member]
Unit_pure in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
AB InBev [member]      
Disclosure of other equity instruments [line items]      
RSUs and PSUs outstanding at 1 January 31.2 29.0 28.7
RSUs and PSUs issued during the year 9.7 7.3 5.9
RSUs and PSUs vested during the year (14.9) (4.1) (4.3)
RSUs and PSUs forfeited during the year (0.8) (1.1) (1.3)
RSUs and PSUs outstanding at the end of December 25.2 31.2 29.0
Brazil [Member] | Ambev [member]      
Disclosure of other equity instruments [line items]      
RSUs and PSUs outstanding at 1 January 120.4 120.0 109.8
RSUs and PSUs issued during the year 33.9 25.6 33.7
RSUs and PSUs vested during the year (48.7) (20.3) (18.3)
RSUs and PSUs forfeited during the year (4.8) (4.9) (5.2)
RSUs and PSUs outstanding at the end of December 100.8 120.4 120.0