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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, 2022 | Jun. 30, 2021
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 100.00% | 100.00%
Consolidated sales revenue | $ 29,775 | $ 33,083
China |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 52.10% | 59.90%
Consolidated sales revenue | $ 15,521 | $ 19,805
UNITED STATES |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 16.30% | 11.50%
Consolidated sales revenue | $ 4,848 | $ 3,816
Asia (excluding China and Japan) |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 9.10% | 9.50%
Consolidated sales revenue | $ 2,698 | $ 3,157
Japan |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 6.80% | 7.20%
Consolidated sales revenue | $ 2,039 | $ 2,373
Europe (excluding UK) |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 6.70% | 5.00%
Consolidated sales revenue | $ 1,995 | $ 1,667
Canada |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 3.10% | 2.40%
Consolidated sales revenue | $ 933 | $ 793
Australia |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 2.00% | 1.60%
Consolidated sales revenue | $ 596 | $ 519
UK |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 0.40% | 0.50%
Consolidated sales revenue | $ 133 | $ 166
Other countries |  |
Disclosure of geographical areas [line items] |  |
Sales revenue by destination (as a percent) | 3.50% | 2.40%
Consolidated sales revenue | $ 1,012 | $ 787

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