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Changes in Equity and Earnings Per Share - Summary of EPS (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Earnings per share [abstract]    
Profit attributable to equity holders of AB InBev $ 6,314 $ 3,824
Weighted average number of ordinary and restricted shares 1,976 1,989
Basic EPS $ 3.2 $ 1.92
Profit attributable to equity holders of AB InBev $ 6,314 $ 3,824
Weighted average number of ordinary and restricted shares (diluted) 2,009 2,026
Diluted EPS $ 3.14 $ 1.89
Underlying profit $ 4,314 $ 3,556
Weighted average number of ordinary and restricted shares 1,976 1,989
Underlying EPS $ 2.18 $ 1.79