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Geographical and product analysis - Summary of Sales Revenue by Destination Explanatory (Parenthetical) (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2017 USD ($)
Japan [Member] |
Disclosure Of Geographical Areas [Line Items] |
Increase (decrease) in revenues | $ 177
Asia (excluding China and Japan) [Member] |
Disclosure Of Geographical Areas [Line Items] |
Increase (decrease) in revenues | $ (158)

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- Details
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- Details
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