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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
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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. + References No definition available. + Details
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- Definition Trade and other payables excluding non-financial liabilities. + References No definition available. + Details
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- Details
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