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Segmental information - additional information - Disclosure of sales revenue by destination (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 100.00% | 100.00%
Consolidated sales revenue | $ 33,083 | $ 19,362
China |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 59.90% | 54.90%
Consolidated sales revenue | $ 19,805 | $ 10,633
Asia (excluding China and Japan) |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 9.50% | 11.10%
Consolidated sales revenue | $ 3,157 | $ 2,155
United States of America |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 11.50% | 12.40%
Consolidated sales revenue | $ 3,816 | $ 2,392
Japan |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 7.20% | 8.30%
Consolidated sales revenue | $ 2,373 | $ 1,598
Europe (excluding UK) |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 5.00% | 5.90%
Consolidated sales revenue | $ 1,667 | $ 1,143
Canada |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 2.40% | 2.90%
Consolidated sales revenue | $ 793 | $ 585
Australia |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 1.60% | 1.80%
Consolidated sales revenue | $ 519 | $ 351
UK |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 0.50% | 0.60%
Consolidated sales revenue | $ 166 | $ 112
Other countries |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 2.40% | 2.10%
Consolidated sales revenue | $ 787 | $ 393

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- Definition The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 28 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_28_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 23 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_23_a&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 32 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_32&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 33 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_33_a&doctype=Standard -URIDate 2020-01-01 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_34&doctype=Standard -URIDate 2020-01-01 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 82 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_82_a&doctype=Standard -URIDate 2020-01-01 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_103&doctype=Standard -URIDate 2020-01-01 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_102&doctype=Standard -URIDate 2020-01-01 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2020-01-01 -Paragraph 33 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2020-en-r&anchor=para_33_b_i&doctype=Standard -URIDate 2020-01-01 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B12 -Subparagraph b -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B12_b_v&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B10 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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