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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
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)

X

- Definition

The current portion of non-current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2019-01-01
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X

- 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.

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- Definition

The non-current portion of non-current borrowings. [Refer: Borrowings]

+ References

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-IssueDate 2019-01-01
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-URIDate 2019-03-27

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- Definition

Longterm borrowings at fair value.

+ References

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- Definition

Short term borrowings at fair value.

+ References

No definition available.

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