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Share-Based Payments - Bud Weiser Apac Share-Based Compensation Program (Detail) shares in Millions, Unit_pure in Millions, $ in Millions | 6 Months Ended
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Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) shares
Long Term Incentive Stock Option Plan [member] |  |
Disclosure Of Share Based Compaensation Program [Line Items] |  |
Number of shares granted | shares |  | 0.1
Fair value of options granted |  | $ 2
Restricted Stock Units [member] |  |
Disclosure Of Share Based Compaensation Program [Line Items] |  |
Share-based compensation grant date fair value | $ 2 | $ 52
Budweiser APAC [Member] | Long Term Incentive Stock Option Plan [member] |  |
Disclosure Of Share Based Compaensation Program [Line Items] |  |
Number of shares granted | 69.7 |
Fair value of options granted | $ 52 |
Budweiser APAC [Member] | Restricted Stock Units [member] |  |
Disclosure Of Share Based Compaensation Program [Line Items] |  |
Share-based compensation grant date fair value | 7.0 |
Share-based compensation grant date fair value | $ 84 |
Budweiser APAC [Member] | Share-Based Compensation Plan [member] |  |
Disclosure Of Share Based Compaensation Program [Line Items] |  |
Share-based compensation grant date fair value | 0.2 |
Share-based compensation grant date fair value | $ 1 |
Budweiser APAC [Member] | People bet plan [member] |  |
Disclosure Of Share Based Compaensation Program [Line Items] |  |
Share-based compensation grant date fair value | 0.6 |
Share-based compensation grant date fair value | $ 2 |

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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of share options granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_ii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a&doctype=Standard -URIDate 2019-03-27 + Details
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