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Right-of-use assets and Lease liabilities - Additional Disclosures Related to Leases (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Leases [Abstract] |  |  |
Interest expense on lease liabilities | $ 13 | $ 11 | $ 5
Expense on short-term, low value and variable leases | 4 | 3 |
Total cash outflows for leases | 85 | 59 |
Lease liability payments | 69 | 52 | $ 0
Interest payments | 12 | 5 |
Short-term and low value lease payments | $ 4 | $ 2 |

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- Definition Expense Relating To Short-Term, Low Value and Variable 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 Payment Of Short-term And Low Value Leases, Classified As Operating Activities + References No definition available. + Details
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- Definition Payments Of Interest On Leases, Classified As Operating Activities + 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 -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_g&doctype=Standard -URIDate 2020-01-01 + 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 -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_b&doctype=Standard -URIDate 2020-01-01 + 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 -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_17_e&doctype=Standard -URIDate 2020-01-01 + Details
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