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Pensions and similar obligations - Summary of Weighted Average Assumptions Used in Computing Benefit Obligations (Detail)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
United States [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Discount rate 5.50% 5.70%
Price inflation 2.00% 2.00%
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 87 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 6.30% 6.50%
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 4.70% 4.60%
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 89 years 89 years
Mexico [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Discount rate 9.30% 10.80%
Price inflation 3.50% 3.50%
Future salary increases 4.30% 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
Brazil [Member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Discount rate 11.00% 11.00%
Price inflation 3.50% 3.50%
Future salary increases 4.10%  
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 88 years 88 years
Brazil [Member] | Top of range [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Future salary increases   6.70%
Brazil [Member] | Bottom of range [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Future salary increases   3.90%
United Kingdom [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Discount rate 5.50% 5.60%
Price inflation 2.70% 3.20%
Future pension increases 2.70% 3.10%
United Kingdom [member] | Male [Member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Life expectation for a 65 year old 85 years 86 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 87 years 89 years
AB InBev [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Discount rate 6.00% 6.00%
Price inflation 2.50% 2.50%
Future salary increases 3.70% 3.60%
Future pension increases 2.60% 2.80%
AB InBev [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
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 6.30% 6.30%
AB InBev [member] | Bottom of range [member]    
Disclosure of Weighted average assumptions used to determine benefit obligations [line items]    
Medical cost trend rate 6.00% 5.90%