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General information (Details) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Jul. 01, 2018 USD ($) | Dec. 31, 2020 USD ($) drilling_unit | Dec. 31, 2019 USD ($) | Dec. 31, 2017 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |
Number of offshore drilling units owned by the Company | drilling_unit |  |  | 34 |  |
Debt due within one year |  |  | $ 6,177 | $ 343 |
Restricted and unrestricted cash and cash equivalents | $ 2,003 | $ 2,177 | 723 | 1,357 | $ 1,359
Unrestricted cash and cash equivalents |  |  | 526 | 1,115 |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Income tax expense | $ 8 | 30 | $ 5 | $ (39) |
Adjustment for a subsidiary related to prior years |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |
Income tax expense |  | $ 18 |  |  |

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