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Investments in equity accounted units - Additional information (Detail) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of Investments in equity accounted units [Line Items] |  |  |
Investments in equity accounted units with shares listed on recognised stock exchanges | $ 0 | $ 0 |
Net debt of the group | (3,651,000,000) | 255,000,000 | $ (3,845,000,000)
Investment in equity accounted units [Member] |  |  |
Disclosure of Investments in equity accounted units [Line Items] |  |  |
Net debt of the group | $ (1,248,000,000) | $ (1,158,000,000) |

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- Definition The amount of net debt of the entity. + 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 + Details
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- Definition Disclosure of Investments in equity accounted units [Line Items] + References No definition available. + Details
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- Definition Investments Accounted for Using Equity Method, With Shares Listed on Stock Exchanges + References No definition available. + Details
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- Details
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