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Risk management and financial instruments - Realized and Unrealized Gains and Losses (Details) - (Loss)/gain recognized relating to derivative financial instruments - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |
Loss/(gain) on derivative financial instruments | $ 5 | $ 1
Interest rate cap agreement |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Loss/(gain) on derivative financial instruments | 0 | (2)
Archer convertible debt instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Loss/(gain) on derivative financial instruments | $ 5 | $ 3

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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