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Operating segments - additional information - Consolidated sales revenue by destination (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of geographical areas [line items] |  |  |
Percentage of consolidated sales revenue | 100.00% | 10000.00% | 10000.00%
Consolidated sales revenue | $ 43,165 | $ 40,522 | $ 40,030
China [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Percentage of consolidated sales revenue | 51.30% | 4460.00% | 4420.00%
Consolidated sales revenue | $ 22,135 | $ 18,061 | $ 17,706
Asia (excluding China and Japan) [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Percentage of consolidated sales revenue | 10.60% | 1150.00% | 1280.00%
Consolidated sales revenue | $ 4,558 | $ 4,665 | $ 5,108
United States of America [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Percentage of consolidated sales revenue | 14.20% | 1560.00% | 1430.00%
Consolidated sales revenue | $ 6,125 | $ 6,337 | $ 5,705
Sales revenue adjustment by destination |  | $ (59) | $ (11)
Japan [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Percentage of consolidated sales revenue | 8.90% | 960.00% | 1170.00%
Consolidated sales revenue | $ 3,855 | $ 3,873 | $ 4,701
Europe (excluding UK) [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Percentage of consolidated sales revenue | 6.00% | 930.00% | 780.00%
Consolidated sales revenue | $ 2,610 | $ 3,788 | $ 3,140
Sales revenue adjustment by destination |  | $ 82 | $ 125
Canada [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Percentage of consolidated sales revenue | 3.30% | 330.00% | 280.00%
Consolidated sales revenue | $ 1,478 | $ 1,330 | $ 1,114
Sales revenue adjustment by destination |  | $ 10 | $ 3
Australia [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Percentage of consolidated sales revenue | 1.70% | 180.00% | 180.00%
Consolidated sales revenue | $ 737 | $ 720 | $ 710
UK [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Percentage of consolidated sales revenue | 0.60% | 70.00% | 80.00%
Consolidated sales revenue | $ 248 | $ 264 | $ 325
Sales revenue adjustment by destination |  | $ (122) | $ (124)
Other countries [Member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Percentage of consolidated sales revenue | 3.40% | 360.00% | 380.00%
Consolidated sales revenue | $ 1,419 | $ 1,484 | $ 1,521
Sales revenue adjustment by destination |  | $ 9 | $ 7

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