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Investment in Associates - Summarized Financial Information to Carrying Amount of Company's Interests in Material Associates (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
AB InBev Efes [member] |  |
Disclosure of associates [line items] |  |
Beginning balance | $ 1,135 | $ 1,132
Share of results of associates | 7 | 3
Ending balance | 1,143 | 1,135
Castel [member] |  |
Disclosure of associates [line items] |  |
Beginning balance | 3,566 | 3,239
Effect of movements in foreign exchange | (246) | 270
Dividends received | (36) | (19)
Share of results of associates | 116 | 76
Ending balance | 3,400 | 3,566
Efes [member] |  |
Disclosure of associates [line items] |  |
Beginning balance | 391 | 451
Effect of movements in foreign exchange | (159) | (92)
Dividends received | (67) |
Share of results of associates | 35 | 32
Ending balance | $ 201 | $ 391

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- Definition 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: | duration

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- Definition Share of results of associates. + References No definition available. + Details
Name: | bud_ShareOfResultsOfAssociates
Namespace Prefix: | bud_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of dividends received. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2021-01-01 -Paragraph B12 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B12_a&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of investments in associates in an entity's separate financial statements. [Refer: Associates [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2021-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2021-en-r&anchor=para_10&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_InvestmentsInAssociates
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=bud_CastelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=bud_EfesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |