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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%

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + Details
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