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Risks Arising From Financial Instruments - Additional Information (Detail) |  | 6 Months Ended | 12 Months Ended | 84 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2013 | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Derivative position positive pre-tax impact on equity reserves |  | $ 727,000,000 | $ 548,000,000 |
Amount of exposure equivalent to shares hedged |  | $ 31,236,000,000 | 13,807,000,000 |
Description of methods to use sensitivity analysis is assessed |  | Sensitivity analysis is assessed based on the yearly volatility using daily observable market data during 250 days at 30 June 2020. Sensitivity analysis is assessed based on the yearly volatility using daily observable market data during 250 days at 31 December 2019. |  |
Top of range [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Currency transactional risk impact on consolidated profit before taxes |  | $ 80,000,000 | 35,000,000 |
Ambev [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Derivative and non-derivative financial instruments, net |  | 814,000,000 | 732,000,000 |
Holding Company [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Derivative and non-derivative financial instruments, net |  | 14,694,000,000 | 15,522,000,000 |
Call Options [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Non derivative financial liability |  | 0 |  |
Equity price risk [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Amount of exposure equivalent to shares hedged |  | $ 100,500,000 |  |
Gain recognized in the profit or loss |  |  | $ 3,200,000,000 |
Cash inflow (out flow) from reset of derivative contracts to market prices |  |  |  | $ 29,000,000,000
Reasonable possible volatility rate |  | 51.04% | 25.20% |
Positive/negative impact on profit before tax |  | $ 2,521,000,000 | $ 2,066,000,000 |
Equity price risk [member] | Share-Based Compensation Plan [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Gain recognized in the profit or loss |  |  | (1,000,000) |
Interest Rate Risk [Member] | Floating interest rate [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Carrying value of financial liabilities |  | $ 6,649,000,000 |  |
Proportion of company's financial liabilities |  | 5.90% |  |
Higher/lower interest expense |  | $ 5,000,000 | 16,000,000 |
Higher/lower interest income |  | 72,000,000 | 22,000,000 |
Interest Rate Risk [Member] | Before hedging [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Carrying value of financial liabilities |  | $ 153,000,000 | 68,000,000 |
Credit risk [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Concentration of credit risks, description |  | There was no significant concentration of credit risks with any single counterparty per 30 June 2020 and no single customer represented more than 10% of the total revenue of the group in 2020. |  |
Credit risk [member] | Top of range [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Percentage of revenue accounted by individual customer |  | 10.00% |  |
Deferred consideration on acquisitions [member] | Put Option [Member] | Observable Market Inputs - Level 3 [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Non derivative financial liability |  | $ 7,000,000,000 | $ 7,000,000,000 |
Fair value hedges [member] | Equity price risk [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Gain recognized in the profit or loss |  | $ 724,000,000 |  |
Fair value hedges [member] | Interest Rate Risk [Member] | US Dollar Fixed Rate Bond Hedges [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Issuance amount |  | 10,000,000,000 |  |
Cash flow hedges [member] | Interest Rate Risk [Member] | Pound Sterling Bond Hedges [Member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Issuance amount | 500,000,000 |  |  |
Interest rate percentage | 4.00% |  |  |
Maturity period | September 2025 |  |  |
Grupo Modelo [member] | Equity price risk [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Gain recognized in the profit or loss |  | $ (729,000,000) |  |
SABMiller Group [member] | Equity price risk [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Gain recognized in the profit or loss |  | $ (709,000,000) |  |

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