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Interest expense - Additional Information (Details) - USD ($) |  | 4 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 02, 2018 | Dec. 31, 2020 | Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Jul. 15, 2019 | Apr. 10, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt principal |  | $ 6,177,000,000 |  |  | $ 6,177,000,000 | $ 6,759,000,000 |  |
Write off of unamortized debt discount |  | 87,000,000 | $ 0 | $ 0 | 87,000,000 | 0 |  |
Senior secured notes | Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, face amount | $ 880,000,000 |  |  |  |  |  |  |
Stated interest rate, cash portion (as a percent) | 4.00% |  |  | 4.00% |  |  |  |
Stated interest rate, paid-in-kind portion (as a percent) | 8.00% |  |  | 8.00% |  |  |  |
Total debt principal |  | 515,000,000 |  |  | 515,000,000 | 476,000,000 |  | $ 476,000,000
Face amount representing accrued interest compounded |  | 39,000,000 |  |  | 39,000,000 |  | $ 18,000,000 |
Senior credit facilities | Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt principal |  | $ 5,662,000,000 |  |  | $ 5,662,000,000 | $ 5,662,000,000 |  |
Senior credit facilities | Secured Debt | LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Increase in basis spread on variable interest rate | 1.00% |  |  |  |  |  |  |

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