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Assets Classified as Held for Sale, Liabilities Associated With Assets Held for Sale and Discontinued Operations - Additional Information (Detail) - USD ($) $ in Millions |  |  | 6 Months Ended | 12 Months Ended
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Jun. 01, 2020 | Jul. 19, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Disclosure of Assets Classified as Held for Sale and Discontinued Operations [line items] |  |  |  |  |  |
Sale of Subsidiary company | [1],[2] |  |  |  | $ 92 |
Disposal of net Asset |  |  |  | $ 145 |  | $ 9,692
Derecognisition of net asset |  |  |  | 9,540 |  | 59
Effect of movements in foreign exchange |  |  |  | $ (490) |  | $ 341
Gain on disposal of asset |  | $ 1,919 |  |  |  |
Australia [member] |  |  |  |  |  |
Disclosure of Assets Classified as Held for Sale and Discontinued Operations [line items] |  |  |  |  |  |
Disposal of net Asset |  | 108,000 |  |  |  |
Derecognisition of net asset |  | (85,000) |  |  |  |
Effect of movements in foreign exchange |  | (4,000) |  |  |  |
Gain on disposal of asset |  | $ 19,000 |  |  |  |
Asahi [Member] |  |  |  |  |  |
Disclosure of Assets Classified as Held for Sale and Discontinued Operations [line items] |  |  |  |  |  |
Sale of Subsidiary company |  |  | $ 16,000 |  |  |
[1] | The unaudited condensed consolidated interim statement of cash flows for the six-month period ended 30 June 2019 has been restated to reflect the classification of the Australian operations as discontinued operations.
[2] | The unaudited condensed consolidated interim statement of cash flows for the six-month period ended 30 June 2020 has been presented to include operating, investing and financing activities from discontinued operations separately in the cashflow statement. The unaudited condensed consolidated interim statement of cash flows for the six-month period ended 30 June 2019 has been restated to reflect this change in presentation.

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- Definition Disclosure of assets classified as held for sale and discontinued operations line items. + References No definition available. + Details
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- Definition Reclassification to assets held for sale. + References No definition available. + Details
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- Definition The aggregate cash flows arising from losing control of subsidiaries or other businesses, classified as investing activities. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 39 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_39&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The gain (loss) recognised on the measurement to fair value less costs to sell or on the disposal of the assets or disposal group(s) constituting the discontinued operation. [Refer: Discontinued operations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2019-01-01 -Paragraph 33 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2019-en-r&anchor=para_33_b_iii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in equity resulting from the disposal of subsidiaries. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard -URIDate 2019-03-27 + Details
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