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Risks Arising From Financial Instruments - Additional Information (Detail)
 6 Months Ended 12 Months Ended 84 Months Ended
Sep. 30, 2013
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Disclosure of detailed information about financial instruments [line items]        
Derivative position positive pre-tax impact on equity reserves   $ 727,000,000 $ 548,000,000  
Amount of exposure equivalent to shares hedged   $ 31,236,000,000 13,807,000,000  
Description of methods to use sensitivity analysis is assessed   Sensitivity analysis is assessed based on the yearly volatility using daily observable market data during 250 days at 30 June 2020. Sensitivity analysis is assessed based on the yearly volatility using daily observable market data during 250 days at 31 December 2019.    
Top of range [member]        
Disclosure of detailed information about financial instruments [line items]        
Currency transactional risk impact on consolidated profit before taxes   $ 80,000,000 35,000,000  
Ambev [member]        
Disclosure of detailed information about financial instruments [line items]        
Derivative and non-derivative financial instruments, net   814,000,000 732,000,000  
Holding Company [Member]        
Disclosure of detailed information about financial instruments [line items]        
Derivative and non-derivative financial instruments, net   14,694,000,000 15,522,000,000  
Call Options [member]        
Disclosure of detailed information about financial instruments [line items]        
Non derivative financial liability   0    
Equity price risk [member]        
Disclosure of detailed information about financial instruments [line items]        
Amount of exposure equivalent to shares hedged   $ 100,500,000    
Gain recognized in the profit or loss     $ 3,200,000,000  
Cash inflow (out flow) from reset of derivative contracts to market prices       $ 29,000,000,000
Reasonable possible volatility rate   51.04% 25.20%  
Positive/negative impact on profit before tax   $ 2,521,000,000 $ 2,066,000,000  
Equity price risk [member] | Share-Based Compensation Plan [member]        
Disclosure of detailed information about financial instruments [line items]        
Gain recognized in the profit or loss     (1,000,000)  
Interest Rate Risk [Member] | Floating interest rate [member]        
Disclosure of detailed information about financial instruments [line items]        
Carrying value of financial liabilities   $ 6,649,000,000    
Proportion of company's financial liabilities   5.90%    
Higher/lower interest expense   $ 5,000,000 16,000,000  
Higher/lower interest income   72,000,000 22,000,000  
Interest Rate Risk [Member] | Before hedging [Member]        
Disclosure of detailed information about financial instruments [line items]        
Carrying value of financial liabilities   $ 153,000,000 68,000,000  
Credit risk [member]        
Disclosure of detailed information about financial instruments [line items]        
Concentration of credit risks, description   There was no significant concentration of credit risks with any single counterparty per 30 June 2020 and no single customer represented more than 10% of the total revenue of the group in 2020.    
Credit risk [member] | Top of range [member]        
Disclosure of detailed information about financial instruments [line items]        
Percentage of revenue accounted by individual customer   10.00%    
Deferred consideration on acquisitions [member] | Put Option [Member] | Observable Market Inputs - Level 3 [member]        
Disclosure of detailed information about financial instruments [line items]        
Non derivative financial liability   $ 7,000,000,000 $ 7,000,000,000  
Fair value hedges [member] | Equity price risk [member]        
Disclosure of detailed information about financial instruments [line items]        
Gain recognized in the profit or loss   $ 724,000,000    
Fair value hedges [member] | Interest Rate Risk [Member] | US Dollar Fixed Rate Bond Hedges [Member]        
Disclosure of detailed information about financial instruments [line items]        
Issuance amount   10,000,000,000    
Cash flow hedges [member] | Interest Rate Risk [Member] | Pound Sterling Bond Hedges [Member]        
Disclosure of detailed information about financial instruments [line items]        
Issuance amount 500,000,000      
Interest rate percentage 4.00%      
Maturity period September 2025      
Grupo Modelo [member] | Equity price risk [member]        
Disclosure of detailed information about financial instruments [line items]        
Gain recognized in the profit or loss   $ (729,000,000)    
SABMiller Group [member] | Equity price risk [member]        
Disclosure of detailed information about financial instruments [line items]        
Gain recognized in the profit or loss   $ (709,000,000)