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Geographical and product analysis - Summary of Sales Revenue by Destination Explanatory (Parenthetical) (Detail) $ in Millions	6 Months Ended
	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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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

Increase (decrease) in sales revenue.

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No definition available.

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- Details

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- Details

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