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Contingencies - Summary of Ab Inbev's Material Tax Proceedings Related to Ambev and Its Subsidiaries (Detail) - Ambev [member] - Legal proceedings contingent liability [member] - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Disclosure of detailed information about material tax [line items]    
Income tax and social contribution $ 8,366 $ 10,781
Value-added and excise taxes 4,179 5,514
Other taxes 867 1,018
Material tax net $ 13,412 $ 17,313