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Financial instruments and risk management - Summary of fair value of financial instruments (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about borrowings [Line Items] |  |
Non-current portion of non-current borrowings | $ (13,093) | $ (12,440)
Borrowings (including finance leases) Excluding Overdraft [member] |  |
Disclosure of detailed information about borrowings [Line Items] |  |
Current borrowings | (720) | (312)
Non-current portion of non-current borrowings | (12,086) | (12,440)
Short term borrowings, fair value | (720) | (312)
Medium and long term borrowings, fair value | $ (13,958) | $ (13,554)

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- Definition The current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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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 The non-current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Short term borrowings at fair value. + References No definition available. + Details
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- Details
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