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Share-Based Payments - LTI Stock Option Plan Executives - Additional Information (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Long Term Incentive Stock Option Plan [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Stock options granted   100,000
Fair value of stock options granted | $   $ 2
Long Term Incentive Stock Option Plan [member] | Executive [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Stock options granted 3,600,000 300,000
Long Term Incentive Stock Option Plan [member] | Executive [member] | AB inBev [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Stock options granted 34,300,000 1,000,000
Fair value of stock options granted | $ $ 241 $ 11
Long Term Restricted Stock Unit Program One [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share based payment vesting period 5 years  
Long Term Restricted Stock Unit Program One [member] | Executive [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Stock options granted 6,900,000  
Fair value of stock options granted | $ $ 301  
Long Term Restricted Stock Unit Program Two [member] | Bottom of range [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Restricted stock units, vesting period five years  
Restricted stock units, vesting period variance 2 years 6 months  
Long Term Restricted Stock Unit Program Two [member] | Top of range [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Restricted stock units, vesting period variance 3 years  
Long Term Restricted Stock Unit Program Two [member] | Executive [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Stock options granted 800,000 0
Long term restricted stock unit program two series two [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Restricted stock units, vesting period variance 5 years  
Long term restricted stock unit program two series two [member] | Bottom of range [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Restricted stock units, vesting period ten years  
Performance Share Unit [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation grant date fair value 0 300,000
Performance Share Unit [member] | AB inBev [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of shares grant the right to receive 1  
Long Term Restricted Stock Unit Program Three [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share based payment vesting period 5 years  
Share-based compensation grant date fair value 100,000 100,000
Share-based compensation grant date fair value | $ $ 1 $ 1