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Previous Chapter 11 Proceedings - Additional Information (Details) - USD ($) | Jul. 02, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 26, 2018 | Sep. 12, 2017
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Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Amount of new cash commitments in the form of new notes and equity | $ 1,000,000,000.0 |  |  |  | $ 1,100,000,000 | $ 1,100,000,000
Common shares, issued (in shares) | 100,000,000 | 100,384,435 | 100,234,973 | 100,000,000 |  |
Common stock, value issued |  | $ 10,000,000 | $ 10,000,000 | $ 10,000,000 |  |
Fully diluted, reserved for Employee Incentive Plan | 10.00% |  |  |  |  |
Senior secured notes | Secured Debt |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Debt, face amount | $ 880,000,000 |  |  |  |  |
Commitment Parties [Member] |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Common shares, issued (in shares) | 23,750,000 |  |  |  |  |
Common stock, value issued | $ 200,000,000 |  |  |  |  |
Commitment Parties and Notes Right Offering Subscribers [Member] |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Common shares, issued (in shares) | 54,625,000 |  |  |  |  |
Holders of General Unsecured Claims [Member] |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Common shares, issued (in shares) | 14,250,000 |  |  |  |  |
Old Seadrill Limited and Seadrill Limited 510(b) [Member] |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Common shares, issued (in shares) | 1,900,000 |  |  |  |  |
Other Commitment Parties [Member] |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Common shares, issued (in shares) | 475,000 |  |  |  |  |
Hemen [Member] |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Common shares, issued (in shares) | 5,000,000 |  |  |  |  |
Financial guarantee | Unsecured bonds |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Extinguished financial guarantees | $ 2,400,000,000 |  |  |  |  |
Financial guarantee | Newbuild obligation |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Extinguished financial guarantees | 1,000,000,000.0 |  |  |  |  |
Financial guarantee | Unsecured interest rate and currency swaps |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Extinguished financial guarantees | $ 250,000,000 |  |  |  |  |

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