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Property, Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
 1 Months Ended 6 Months Ended
Oct. 31, 2017
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]        
Contractual commitments for acquisition of property, plant and equipment   $ 596   $ 457
AB InBev's net capital expenditures in the statement of cash flow   1,524 $ 1,488  
Lease agreement term 27 years      
Additions to right of use assets   $ 393 $ 293  
Bottom of range [member] | Dutch and Belgian pub real estate [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Sublease average outstanding period   6 years    
Top of range [member] | Dutch and Belgian pub real estate [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Sublease average outstanding period   8 years    
Production facilities [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Percentage of improve the production facilities   41.00%    
Logistics and commercial investments [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Percentage of logistics and commercial investments   44.00%    
Administrative capabilities and purchase of hardware and software [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Percentage of improving administrative capabilities and for the purchase of hardware and software   15.00%    
Property, plant and equipment subject to operating leases [member] | Bottom of range [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Operating lease initial period   5 years    
Property, plant and equipment subject to operating leases [member] | Top of range [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Operating lease initial period   10 years    
Gross carrying amount [member] | Restrictions [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Property, plant and equipment, restrictions on title   $ 2   $ 4