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Financial instruments and risk management - Additional Information (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | May 11, 2018 | Apr. 26, 2017
--- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |
Convertible bond issued by Archer | $ 433 | $ 258 |  |
Interest rate cap | Not designated as a hedge |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative asset purchased |  |  | $ 68 |
Interest rate cap | Not designated as a hedge | LIBOR |  |  |  |
Derivative [Line Items] |  |  |  |
Capped rate | 2.87% |  |  |
Archer | Convertible bond |  |  |  |
Derivative [Line Items] |  |  |  |
Convertible bond issued by Archer |  |  |  | $ 13

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