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Right-of-use assets and Lease liabilities - Additional Disclosures Related to Leases (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018
Leases [Abstract] |  |  |
Interest expense on lease liabilities | $ 3 | $ 5 |
Expense on short-term and low value leases | 1 | 2 |
Total cash outflows for leases | 12 | 24 |
Thereof: Repayment of lease liabilities | $ 11 | $ 22 | $ 0

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- Definition Expense Relating To Short-Term And Low Value Leases For Which Recognition Exemption Has Been Used + References No definition available. + Details
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- Definition Leases [Abstract] + References No definition available. + Details
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- Definition The cash outflow for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2018-01-01 -Paragraph 53 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_53_g&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2018-01-01 -Paragraph 53 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_53_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The cash outflow for payment of lease liabilities, classified as financing activities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2019-01-01 -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_17_e&doctype=Standard -URIDate 2018-03-16 + Details
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