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Share-Based Payments - Other Programs - Additional Information (Detail) shares in Millions, Unit_pure in Millions | 12 Months Ended |
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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 |  |

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