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Fresh Start Accounting - Additional Information (Details) - USD ($) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 02, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 17, 2018 | Feb. 26, 2018
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Distributable value | $ 11,056,000,000 |  |  |  |  | $ 11,000,000,000.0 |
WACC |  |  | 11.40% |  |  |  |
Debt, fair value | 7,301,000,000 |  |  |  |  |  |
Debt, book value | $ 7,600,000,000 |  |  |  |  |  |
Common stock, shares issued (in shares) | 100,000,000 |  | 100,384,435 | 100,234,973 | 100,000,000 |  |
Per share value (in dollars per share) | $ 35.01 |  |  |  |  |  |
Minimum | Plan |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Distributable value |  |  |  |  |  |  | $ 10,200,000,000
Maximum | Plan |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Distributable value |  |  |  |  |  |  | $ 11,800,000,000
Senior secured notes | Secured Debt |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Debt, fair value | $ 890,000,000 |  |  |  |  |  |
Proceeds from issuance | 875,000,000 |  |  |  |  |  |
Debt, face amount | 880,000,000 |  |  |  |  |  |
Interest accrual | 5,000,000 |  |  |  |  |  |
Write-off of unamortized debt issuance costs | $ 9,000,000 |  |  |  |  |  |
Commitment Parties (in exchange for cash paid pursuant to the Investment Agreement) and Equity Rights Offering Subscribers |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Common stock, shares issued (in shares) | 23,750,000 |  |  |  |  |  |
Common stock, price per share (in dollars per share) | $ 8.42 |  |  |  |  |  |
Recipients of Senior Secured Notes (including Commitment Parties and Notes Rights Offering Subscribers) |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Common stock, shares issued (in shares) | 54,625,000 |  |  |  |  |  |
Holders of General Unsecured Claims |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Common stock, shares issued (in shares) | 14,250,000 |  |  |  |  |  |
Former Holders of Old Seadrill Limited Equity and Seadrill Limited 510(b) Claimants |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Common stock, shares issued (in shares) | 1,900,000 |  |  |  |  |  |
Hemen (on account of Primary Structuring Fee) |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Common stock, shares issued (in shares) | 5,000,000 |  |  |  |  |  |
Fresh Start Adjustments |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Adjustments, increase (decrease), Amount due from related parties - current |  | $ 14,000,000 |  |  |  |  |
Deferred mobilization cost, current |  | 9,000,000 |  |  |  |  |
Favorable drilling contracts, current |  | 190,000,000 |  |  |  |  |
Adjustments, increase (decrease), Amount due from related parties - non-current |  | 11,000,000 |  |  |  |  |
Embedded derivative |  | 2,000,000 |  |  |  |  |
Deferred mobilization, noncurrent |  | 2,000,000 |  |  |  |  |
Favorable contracts, unamortized |  | 1,000,000 |  |  |  |  |
Favorable drilling and management service, noncurrent |  | 98,000,000 |  |  |  |  |
Short term portion of deferred mobilization revenues |  | 27,000,000 |  |  |  |  |
Accrued interest expense |  | 59,000,000 |  |  |  |  |
Deferred mobilization revenues |  | 7,000,000 |  |  |  |  |
Unfavorable drilling contracts |  | 9,000,000 |  |  |  |  |
Fresh Start Adjustments | Secured Debt |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Debt discount |  | 188,000,000 |  |  |  |  |
Fresh Start Adjustments | Senior secured notes | Secured Debt |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Write-off of unamortized debt issuance costs |  | 51,000,000 |  |  |  |  |
Fresh Start Adjustments | Seadrill Partners | West Vela |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Adjustments, increase (decrease), Amount due from related parties - current |  | 14,000,000 |  |  |  |  |
Fresh Start Adjustments | Seadrill Partners | West Vela and West Polaris |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Adjustments, increase (decrease), Amount due from related parties - non-current |  | 17,000,000 |  |  |  |  |
Fresh Start Adjustments | Seabras Sapura |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Adjustments, increase (decrease), Amount due from related parties - non-current |  | $ (3,000,000) |  |  |  |  |
Income Approach |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Debt, fair value | $ 7,300,000,000 |  |  |  |  |  |

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