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Employee Benefits - Summary of Weighted Average Assumptions Used in Computing Benefit Obligations (Detail)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
United States [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Discount rate 2.80% 2.50%
Price inflation 2.50% 2.50%
United States [member] | Male [Member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Life expectation for a 65 year old 86 years 86 years
United States [member] | Female [Member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Life expectation for a 65 year old 88 years 87 years
United States [member] | Top of range [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Medical cost trend rate 5.30% 5.50%
United States [member] | Bottom of range [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Medical cost trend rate 4.50% 4.50%
Canada [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Discount rate 2.90% 2.40%
Price inflation 2.00% 2.00%
Future salary increases 1.00% 1.00%
Future pension increases 2.00% 2.00%
Medical cost trend rate 4.50% 4.50%
Canada [member] | Male [Member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Life expectation for a 65 year old 87 years 87 years
Canada [member] | Female [Member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Life expectation for a 65 year old 90 years 90 years
Mexico [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Discount rate 8.00% 6.30%
Price inflation 3.50% 3.50%
Future salary increases   4.30%
Future pension increases 3.50% 3.50%
Mexico [member] | Male [Member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Life expectation for a 65 year old 85 years 82 years
Mexico [member] | Female [Member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Life expectation for a 65 year old 88 years 85 years
Mexico [member] | Top of range [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Future salary increases 4.50%  
Mexico [member] | Bottom of range [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Future salary increases 4.00%  
Brazil [Member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Discount rate 8.70% 6.90%
Price inflation 3.30% 3.30%
Future pension increases 3.30% 3.30%
Medical cost trend rate 6.90% 6.90%
Brazil [Member] | Male [Member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Life expectation for a 65 year old 85 years 85 years
Brazil [Member] | Female [Member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Life expectation for a 65 year old 87 years 88 years
Brazil [Member] | Top of range [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Future salary increases 6.90% 6.90%
Brazil [Member] | Bottom of range [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Future salary increases 5.00% 5.00%
United Kingdom [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Discount rate 1.90% 1.40%
Price inflation 3.60% 3.10%
Future pension increases 3.20% 2.90%
United Kingdom [member] | Male [Member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Life expectation for a 65 year old 87 years 87 years
United Kingdom [member] | Female [Member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Life expectation for a 65 year old 89 years 89 years
AB inBev [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Discount rate 3.20% 2.60%
Price inflation 2.70% 2.60%
Future salary increases 3.70% 3.70%
Future pension increases 2.70% 2.60%
AB inBev [member] | Male [Member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Life expectation for a 65 year old 85 years 85 years
AB inBev [member] | Female [Member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Life expectation for a 65 year old 88 years 88 years
AB inBev [member] | Top of range [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Medical cost trend rate 5.90% 6.00%
AB inBev [member] | Bottom of range [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Medical cost trend rate 5.70% 5.70%