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Share-Based Payments - Other Programs - Additional Information (Detail)
shares in Millions, Unit_pure in Millions
 12 Months Ended
Dec. 31, 2021
EUR (€)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
shares
Dec. 31, 2021
USD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Description on calculation of expected volatility Expected volatility is based on historical volatility calculated over a 10-year period. Expected volatility is based on historical volatility calculated over a 10-year period.    
Description on exercise price of options The binomial Hull model assumes that all employees would immediately exercise their options if the AB InBev share price is 2.5 times above the exercise price. The binomial Hull model assumes that all employees would immediately exercise their options if the AB InBev share price is 2.5 times above the exercise price.    
Weighted average remaining contractual life of options and warrants 6.50 years 6.50 years    
Options and warrants outstanding 102.7     102.7
Options and warrants vested 24.3 24.3    
Weighted average share price at the date of exercise € 53.47 $ 60.56    
Senior Management [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Share based payment vesting period 6 months 6 months    
Vesting acceleration of stock options and restricted stock units 0.0 0.0 0.1  
Bottom of range [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price of outstanding options and warrants € 10.32     $ 11.69
Top of range [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Exercise price of outstanding options and warrants € 121.95     $ 138.12
Long Term Restricted Stock Unit Program Three [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Share based payment vesting period 5 years 5 years