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Previous Chapter 11 Proceedings - Schedule of Key terms of the Plan of Reorganization (Details) - shares | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 05, 2019 | Dec. 31, 2018 | Jul. 02, 2018
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Fresh-Start Adjustment [Line Items] |  |  |  |  |
Number of shares | 100,384,435 | 100,234,973 |  | 100,000,000 | 100,000,000
Prior to dilution by the shares reserved under the Employee Incentive Plan |  |  |  |  | 100.00%
Fully diluted |  |  |  |  | 90.00%
Number of shares authorized (in shares) |  |  |  |  | 11,111,111
Total, fully diluted (in shares) | 138,880,000 | 138,880,000 | 138,880,000 |  | 111,111,111
Fully diluted, reserved for Employee Incentive Plan |  |  |  |  | 10.00%
Total fully diluted |  |  |  |  | 100.00%
Commitment Parties (in exchange for cash paid pursuant to the Investment Agreement) and Equity Rights Offering Subscribers |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Number of shares |  |  |  |  | 23,750,000
Prior to dilution by Primary Structuring Fee and the shares reserved under the Employee Incentive Plan |  |  |  |  | 25.00%
Prior to dilution by the shares reserved under the Employee Incentive Plan |  |  |  |  | 23.75%
Fully diluted |  |  |  |  | 21.38%
Recipients of Senior Secured Notes (including Commitment Parties and Notes Rights Offering Subscribers) |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Number of shares |  |  |  |  | 54,625,000
Prior to dilution by Primary Structuring Fee and the shares reserved under the Employee Incentive Plan |  |  |  |  | 57.50%
Prior to dilution by the shares reserved under the Employee Incentive Plan |  |  |  |  | 54.63%
Fully diluted |  |  |  |  | 49.16%
Holders of General Unsecured Claims |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Number of shares |  |  |  |  | 14,250,000
Prior to dilution by Primary Structuring Fee and the shares reserved under the Employee Incentive Plan |  |  |  |  | 15.00%
Prior to dilution by the shares reserved under the Employee Incentive Plan |  |  |  |  | 14.25%
Fully diluted |  |  |  |  | 12.82%
Former Holders of Old Seadrill Limited Equity and Seadrill Limited 510(b) Claimants |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Number of shares |  |  |  |  | 1,900,000
Prior to dilution by Primary Structuring Fee and the shares reserved under the Employee Incentive Plan |  |  |  |  | 2.00%
Prior to dilution by the shares reserved under the Employee Incentive Plan |  |  |  |  | 1.90%
Fully diluted |  |  |  |  | 1.71%
Fees to Select Commitment Parties |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Number of shares |  |  |  |  | 475,000
Prior to dilution by Primary Structuring Fee and the shares reserved under the Employee Incentive Plan |  |  |  |  | 0.50%
Prior to dilution by the shares reserved under the Employee Incentive Plan |  |  |  |  | 0.47%
Fully diluted |  |  |  |  | 0.43%
All creditors, excluding Primary Structuring Fee |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Number of shares |  |  |  |  | 95,000,000
Prior to dilution by Primary Structuring Fee and the shares reserved under the Employee Incentive Plan |  |  |  |  | 100.00%
Prior to dilution by the shares reserved under the Employee Incentive Plan |  |  |  |  | 95.00%
Fully diluted |  |  |  |  | 85.50%
Hemen (on account of Primary Structuring Fee) |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |
Number of shares |  |  |  |  | 5,000,000
Prior to dilution by the shares reserved under the Employee Incentive Plan |  |  |  |  | 5.00%
Fully diluted |  |  |  |  | 4.50%

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