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Financial instruments and risk management - Realized and Unrealized Gains and Losses (Details) - (Loss)/gain recognized relating to derivative financial instruments - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Loss on derivative financial instruments | $ (31) | $ (4) | $ 0 | $ (37)
Interest rate cap agreement |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Loss on derivative financial instruments | (22) | (6) | (3) | (37)
Archer convertible debt instrument |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Loss on derivative financial instruments | $ (9) | $ 2 | $ 3 | $ 0

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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=121590274&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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