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Financial instruments and risk management - Summary of maximum credit risk exposure of the Group's financial assets (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Credit Risk Exposure [Line Items]
Trade and other receivables	$ 2,985	$ 3,047
Increase (decrease) due to corrections of prior period errors [member]
Disclosure Of Credit Risk Exposure [Line Items]
Trade and other receivables		$ (385)

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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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No definition available.

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- Definition

Trade and other receivables excluding non-financial assets.

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No definition available.

+ Details

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- Details

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