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Geographical and product analysis - Summary of Sales Revenue by Destination Explanatory (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Disclosure Of Geographical Areas [Line Items] |  |
Consolidated sales revenue | $ 19,914 | $ 19,319
Consolidated Sales Revenue by Destination [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Sales revenue by destination, percentage | 100.00% | 100.00%
Consolidated sales revenue | $ 19,914 | $ 19,319
China [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Sales revenue by destination, percentage | 44.90% | 43.60%
Consolidated sales revenue | $ 8,946 | $ 8,414
Asia (excluding China and Japan) [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Sales revenue by destination, percentage | 11.60% | 13.20%
Consolidated sales revenue | $ 2,316 | $ 2,546
United States of America [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Sales revenue by destination, percentage | 15.70% | 13.90%
Consolidated sales revenue | $ 3,117 | $ 2,683
Japan [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Sales revenue by destination, percentage | 10.10% | 12.20%
Consolidated sales revenue | $ 2,019 | $ 2,363
Europe (excluding UK) [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Sales revenue by destination, percentage | 8.50% | 7.80%
Consolidated sales revenue | $ 1,700 | $ 1,498
Canada [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Sales revenue by destination, percentage | 3.20% | 2.70%
Consolidated sales revenue | $ 634 | $ 525
Australia [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Sales revenue by destination, percentage | 1.80% | 1.80%
Consolidated sales revenue | $ 353 | $ 350
UK [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Sales revenue by destination, percentage | 0.90% | 1.10%
Consolidated sales revenue | $ 173 | $ 219
Other [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Sales revenue by destination, percentage | 3.30% | 3.70%
Consolidated sales revenue | $ 656 | $ 721

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