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Financial instruments and risk management - Summary of fair value of financial instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about borrowings [Line Items]
Borrowings	$ 13,831	$ 14,115
Borrowings excluding overdrafts
Disclosure of detailed information about borrowings [Line Items]
Borrowings	12,653	12,806
Borrowings, fair value	$ 15,076	$ 14,678

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
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-URIDate 2020-01-01

+ Details

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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

Borrowings, Fair Value

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Details

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