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Financial instruments and risk management - Summary of financial liabilities by categories (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of financial liabilities [Abstract]
Trade and other payables	$ 5,922	$ 5,209
Increase (decrease) due to corrections of prior period errors [member]
Disclosure of financial liabilities [Abstract]
Trade and other payables		$ (177)

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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

Trade and other payables excluding non-financial liabilities.

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