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Financial instruments and risk management - Summary of fair value of financial instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about borrowings [Line Items]
Borrowings (including overdrafts), carrying value	$ 13,531	$ 13,831
Borrowings excluding overdrafts
Disclosure of detailed information about borrowings [Line Items]
Borrowings (including overdrafts), carrying value	12,168	12,653
Borrowings (including overdrafts), fair value	$ 13,904	$ 15,076

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 2021-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard
-URIDate 2021-03-24

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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X

- Definition

Borrowings, Fair Value

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
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