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Goodwill - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Cost to sell expected to reach as percentage of entity value |  | 2.00% |
Adverse change in WACC | 1.00% | 1.00% |
Additional recognition, goodwill |  | $ 14 | $ 307
Impairment of goodwill | $ 2,500 | $ 2,500 |
Probability in percentage terms of goodwill impairment |  | 30.00% |
Goodwill Impairment Scenario One [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Percentage Increase In The Probability For Goodwill Impairment |  | 5.00% |
South Africa Cash Generating Unit [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Impairment of goodwill |  | $ (1,500) |
Rest Of Africa Cash Generating Unit [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Impairment of goodwill |  | (1,000) |
South Africa And Rest Of Africa Cash Generarting Units [Member] | Thirty Percentage Probability Of Occurrence [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Impact On Goodwill Impairment Loss |  | $ 6,000 |
Probability Of Goodwill Impairment In Percentage |  | 30.00% |
South Africa And Rest Of Africa Cash Generarting Units [Member] | Goodwill Impairment Scenario One [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Additional impairment charges to goodwill |  | $ 4,000 |
Bottom of range [member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Growth rate used to extrapolate cash flow projections | 2.00% | 2.00% |
Probability in percentage terms of goodwill impairment |  | 15.00% |
Bottom of range [member] | Worst Case Scenario [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Growth rate used to extrapolate cash flow projections | 15.00% | 15.00% |
Top of range [member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Growth rate used to extrapolate cash flow projections | 5.00% | 5.00% |
Probability in percentage terms of goodwill impairment |  | 30.00% |
Top of range [member] | Worst Case Scenario [Member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Growth rate used to extrapolate cash flow projections | 30.00% | 30.00% |
AB inBev [member] |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |
Additional recognition, goodwill |  | $ 73 | $ 389

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