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Related party transactions - Fair Value Gain/Loss on Convertible Bond (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2018	Jul. 01, 2018	Dec. 31, 2020	Dec. 31, 2018
Related Party Transaction [Line Items]
Fair value (loss) / gain	$ (11)	$ 0	$ (29)	$ 0
Archer | Fair value gain/ (loss) of Archer debt component
Related Party Transaction [Line Items]
Fair value (loss) / gain	3	(3)	4	2
Archer | Fair value gain/ (loss) of Archer embedded conversion option
Related Party Transaction [Line Items]
Fair value (loss) / gain	$ 0	$ (9)	$ 3	$ 2

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- Definition

Related Party Transaction, Fair Value Gain (Loss) On Convertible Bond Receivable

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No definition available.

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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.

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No definition available.

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- Details

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- Details

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