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Assets Classified as Held for Sale, Liabilities Associated With Assets Held for Sale and Discontinued Operations - Schedule of Assets Held for Sale (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of Assets and Liabilities of Disposal Groups Classified as Held for Sale [abstract]
Balance at the end of previous year	$ 74	$ 10,013
Reclassified to assets held for sale in the period	11	210
Impairment losses	(20)
Disposals	(33)	(9,665)
Effect of movements in foreign exchange	(2)	(484)
Balance at the end of year	$ 30	$ 74

X

- Definition

Asset held for sale effect of movements in foreign exchange

+ References

No definition available.

+ Details

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Namespace Prefix:	bud_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Assets held for sale impairment losses.

+ References

No definition available.

+ Details

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Namespace Prefix:	bud_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Disclosure of Assets and Liabilities of Disposal Groups Classified as Held for Sale Explanatory [abstract]

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No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Reclassification to assets held for sale.

+ References

No definition available.

+ Details

Name:	bud_ReclassificationToAssetsHeldForSale
Namespace Prefix:	bud_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of current assets other than non-current assets or disposal groups classified as held for sale or as held for distribution to owners. [Refer: Current assets; Disposal groups classified as held for sale [member]; Non-current assets or disposal groups classified as held for sale; Non-current assets or disposal groups classified as held for distribution to owners]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 66
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_66&doctype=Standard
-URIDate 2021-03-24

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Balance Type:	debit
Period Type:	instant

X

- Definition

The increase (decrease) in equity resulting from the disposal of subsidiaries. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2021-03-24

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