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Borrowings and other financial liabilities - Summary of detailed information about borrowings (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about borrowings [Line Items]
Notional amount	$ 1,656	$ 1,786
Cumulative amount utilised from debt issuance	1,600	1,600
Carrying value of bonds	$ 1,600	1,600
Increase in stated percentage	1.00%
Borrowings	$ 14,115	12,752
Debt instrument restrictive covenants	4,500	4,600
European debt issuance programme
Disclosure of detailed information about borrowings [Line Items]
Notional amount	$ 10,000	$ 10,000

X

- Definition

The amount of bonds issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2019-03-27

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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 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
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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.

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- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2019-03-27

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- Definition

Cumulative amount utilised from debt issuance.

+ References

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+ Details

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- Definition

Debt instrument interest rate stated percentage increase.

+ References

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- Definition

Debt instruments restrictive covenants.

+ References

No definition available.

+ Details

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- Details

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