Employee Benefits - Summary of Changes in Present Value of Defined Benefit Obligations and Changes in Fair Value of Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of defined benefit plans [line items]
Defined benefit obligation at 1 January	$ 2,964
Interest cost	(73)	$ (82)	$ (95)
Actuarial gains/(losses) - demographic assumptions	(334)	(500)
Defined benefit obligation at 31 December	2,256	2,964
Present Value of Defined Benefit Obligation [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation at 1 January	(8,496)	(8,143)	(7,568)
Current service costs	(80)	(72)	(67)
Interest cost	(212)	(250)	(326)
Past service gain/(cost)	(5)	16	(9)
Assets distributed on settlements	176	153	109
Benefits paid	553	519	596
Contribution by plan participants	(3)	(2)	(2)
Actuarial gains/(losses) - demographic assumptions	(41)	20	61
Actuarial gains/(losses) - financial assumptions	460	(690)	(912)
Experience adjustments	16	(12)	29
Exchange differences	154	(35)	(86)
Transfers and other movements		0	32
Defined benefit obligation at 31 December	(7,478)	(8,496)	(8,143)
Plan Assets [Member]
Disclosure of defined benefit plans [line items]
Defined benefit obligation at 1 January	5,649	5,442	5,059
Interest cost	137	168	218
Administration costs	(19)	(19)	(23)
Assets distributed on settlements	(172)	(146)	(107)
Return on plan assets exceeding interest income	197	332	579
Benefits paid	(553)	(519)	(596)
Contributions by AB InBev	241	394	294
Contribution by plan participants	3	2	2
Exchange differences	(102)	(9)	46
Transfers and other movements	0	4	(30)
Defined benefit obligation at 31 December	$ 5,381	$ 5,649	$ 5,442

Actuarial gains losses arising from changes in experience adjustment net defined benefit liability asset.

No definition available.

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- Definition

Administrative Cost Defined Benefit Liability Asset

+ References

No definition available.

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

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The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan in respect of settlements. [Refer: Decrease (increase) in net defined benefit liability (asset) resulting from gains (losses) arising from settlements; Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

+ References

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