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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