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Exceptional Items - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
May 31, 2021
Jun. 01, 2020
Jun. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Exceptional Items [line items]            
Exceptional restructuring charges       $ (172) $ (157) $ (170)
Acquisition costs business combinations       (17) (25) (23)
Business and asset disposal       (247) (239) (50)
NET finance (cost) income       (806) (1,738) 882
Decrease of income taxes       346 (155) 6
Non-controlling interest on the exceptional items       20 228 108
Impairment of goodwill     $ (2,500)   (2,500)  
COVID-19 Costs incurred on account of unforeseen events       (105) (182)  
Disposal group discontinue operations gain loss on disposal of business   $ 1,919        
Zenzele Kabili costs       (72)    
Exception non cash imapirment charge investment in joint ventures       $ (258)    
Carlton United Breweries [Member]            
Disclosure of Exceptional Items [line items]            
Disposal group discontinue operations gain loss on disposal of business   $ 1,919     $ 1,919  
Budweiser APAC [Member]            
Disclosure of Exceptional Items [line items]            
Fees related to the initial public offering of a minority stake of Budweiser APAC           (117)
Expenses relating to share issuance cost reported in the income statement           (6)
capitalization of share issuance cost in equity           (111)
Stamp Duties In Equity That Are Directly Attributable To The Public Offering           (58)
Brazilian State Tax Regularization Program [Member]            
Disclosure of Exceptional Items [line items]            
Payment related to Special Value-added Tax (ICMS) Amnesty Program           $ (74)
Zenzele Kabili costs $ (72)