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Borrowings and other financial liabilities - Summary of detailed information about borrowings (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about borrowings [Line Items] |  |
Cumulative amount utilised from debt issuance | $ 1,600 | $ 2,200
Carrying value of bonds | $ 1,600 | 2,200
Increase in stated percentage | 1.00% |
Borrowings | $ 12,752 | 15,176
Subsidiary borrowings | 2,400 | 2,700
Debt instrument restrictive covenants | 4,600 | 4,700
European debt issuance programme [member] |  |
Disclosure of detailed information about borrowings [Line Items] |  |
Notional amount | $ 10,000 | $ 10,000

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- Definition The amount of bonds issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- 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 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + 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 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 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Cumulative amount utilised from debt issuance. + References No definition available. + Details
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- Definition Debt instrument interest rate stated percentage increase. + References No definition available. + Details
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- Definition Debt instruments restrictive covenants. + References No definition available. + Details
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- Definition Subsidiary borrowings. + References No definition available. + Details
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Period Type: | instant

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- Details
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Period Type: |