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Related party transactions - Gains in Other Operating Income (Details) $ in Millions |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 13, 2020 USD ($) | Dec. 31, 2018 USD ($) | Jul. 01, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Apr. 26, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Carrying value of related party receivable |  |  |  | $ 477 | $ 704 |  |  |
Net loss on debt extinguishment |  | $ 0 | $ 0 | 0 | (22) |  | $ 19 |
Impairment of investments |  | 0 | 0 | $ 47 | 302 |  |  |
Discount rate | Discounted cash flow |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Loan receivable, measurement input |  |  |  | 0.14 |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Total contingent consideration recognized |  | 0 | 0 | $ 0 |  | $ 7 |  |
Archer Convertible Bond |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Impairment of investments |  |  |  | 29 | $ 11 |  |  |
Related party receivable fair value |  |  |  | 13 |  |  |  |
West Vela earn out realized | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Total contingent consideration recognized |  | $ 0 | $ 0 | 0 |  | $ 7 |  |
Subordinated loans including accrued interest and fees | Archer Convertible Bond |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party receivable fair value |  |  |  | $ 10 |  |  |  |
Subordinated loans including accrued interest and fees | Archer |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party receivable before conversion |  |  |  |  |  |  |  | $ 146
Related party receivable after conversion |  |  |  |  |  |  |  | 45
Interest rate on related party receivable | 5.50% |  |  | 5.50% |  |  |  |
Carrying value of related party receivable | $ 13 |  |  |  |  |  |  |
Embedded derivative option | Archer Convertible Bond |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party receivable fair value |  |  |  | $ 3 |  |  |  |
Fair value | Subordinated loans including accrued interest and fees | Archer |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Carrying value of related party receivable |  |  |  |  |  |  |  | 56
Carrying value | Subordinated loans including accrued interest and fees | Archer |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Carrying value of related party receivable |  |  |  |  |  |  |  | $ 37

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