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Related party transactions - Analysis of Related Party Payable Balances (Details) $ in Millions | 3 Months Ended | 4 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) | Jul. 01, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party liabilities |  | $ 433 | $ 433 |  |  | $ 433 | $ 258
Amounts due to related parties - current |  | (7) | (7) |  |  | (7) | (19)
Long-term debt due to related parties |  | (426) | (426) |  |  | (426) | (239)
Write off of unamortized debt discount |  |  | 87 | $ 0 | $ 0 | 87 | 0
Fair value measurement on deconsolidation of VIE | [1] |  |  | 0 | 0 | 509 | 0
Related party loans payable |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party liabilities |  | 426 | 426 |  |  | $ 426 | 0
Interest expense on related party payable |  |  |  | $ 7 | $ 7 |  | 14
Related party loans payable | Minimum |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Interest rate on related party payable |  |  |  |  |  | 1.00% |
Related party loans payable | Maximum |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Interest rate on related party payable |  |  |  |  |  | 4.50% |
Trading balances |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party liabilities |  | 7 | 7 |  |  | $ 7 | 19
Ship Finance SPV's | Related party loans payable |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total related party liabilities |  | 0 | 0 |  |  | 0 | 239
Debt principal outstanding |  |  |  |  |  |  | $ 314
Due to related parties, carrying value prior to deconsolidation |  | 933 | 933 |  |  | 933 |
Due to related parties, fair value at deconsolidation |  | 424 | $ 424 |  |  | 424 |
Write off of unamortized debt discount |  | $ 2 |  |  |  |  |
Fair value measurement on deconsolidation of VIE |  |  |  |  |  | $ 509 |
Ship Finance SPV's | Related party loans payable | Discounted cash flow | Discount rate |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Fair value, cost of debt percent |  | 0.37 | 0.37 |  |  | 0.37 |
[1] | Includes transactions with related parties. Refer to Note 32 - "Related party transactions" for further details.

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