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Risk management and financial instruments - Derivative Narrative (Details) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 11, 2018 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) | Apr. 26, 2017 USD ($)
Derivative [Line Items] |  |  |  |
Total related party liabilities |  | $ 433 | $ 635 |
Discounted cash flow | Discount rate |  |  |  |
Derivative [Line Items] |  |  |  |
Senior secured note, yield |  | 37.00% |  |
Discounted cash flow | Discount rate | Secured credit facilities |  |  |  |
Derivative [Line Items] |  |  |  |
Weighted average cost of capital |  |  | 0.118 |
Interest rate cap |  |  |  |
Derivative [Line Items] |  |  |  |
Purchase of derivative instrument | $ 68 |  |  |
Interest rate cap | LIBOR |  |  |  |
Derivative [Line Items] |  |  |  |
Capped rate | 2.87% |  |  |
Archer | Convertible bond |  |  |  |
Derivative [Line Items] |  |  |  |
Total related party liabilities |  |  |  | $ 45

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