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Pension and similar obligations - Summary of Weighted Average Assumptions Used in Computing Benefit Obligations (Detail)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
United States [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Discount rate 5.30% 5.50%
Price inflation 2.00% 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 88 years
United States [member] | Top of range [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Medical cost trend rate 6.80% 7.00%
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 4.60% 5.10%
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 9.30% 9.50%
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 85 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 88 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 9.20% 10.00%
Price inflation 3.50% 3.50%
Future pension increases 3.50% 3.50%
Medical cost trend rate 7.10% 7.10%
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 87 years
Brazil [Member] | Top of range [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Future salary increases 6.70% 7.10%
Brazil [Member] | Bottom of range [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Future salary increases 3.90% 5.30%
United Kingdom [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Discount rate 4.70% 4.90%
Price inflation 3.20% 3.20%
Future pension increases 3.10% 3.00%
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 5.60% 5.90%
Price inflation 2.60% 2.70%
Future salary increases 3.70% 4.00%
Future pension increases 2.80% 2.70%
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 6.70% 6.80%
AB inBev [member] | Bottom of range [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Medical cost trend rate 6.20% 6.10%