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Exceptional Items - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 01, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Disclosure of Exceptional Items [line items]        
Exceptional restructuring charges     $ (60) $ (58) [1]
Acquisition costs business combinations     (4) (21) [1]
Business and asset disposal     (154) (24)
Exceptional net finance cost     (1,388) 1,201
Decrease of income taxes     107 (5)
Non-controlling interest on the exceptional items     46 $ 12
Impairment of goodwill   $ (2,500) (2,500)  
Costs incurred on account of unforeseen events     $ (78)  
Disposal group discontinue operations gain loss on disposal of business $ 1,919      
Carlton United Breweries Member [Member]        
Disclosure of Exceptional Items [line items]        
Disposal group discontinue operations gain loss on disposal of business $ 1,919      
[1] The unaudited condensed consolidated interim income statement for the six-month period ended 30 June 2019 has been restated to reflect the classification of the Australian operations as discontinued operations.