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Chapter 11 Proceedings - Additional Information (Detail) $ in Millions |  |  |  | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 15, 2018 USD ($) | Feb. 28, 2018 USD ($) | Feb. 26, 2018 USD ($) | Jun. 30, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Aug. 08, 2018 USD ($) shares | Sep. 12, 2017 shares
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Amount of new cash commitments in the form of new notes and equity |  |  | $ 1,080.0 |  |  |  |
Number of days after Confirmation Date the plan must effective by |  |  |  | 90 days |  |  |
Bankruptcy claims, unsecured claims, pro rata cash recovery pool |  |  | 23.0 |  |  |  |
Plan of reorganization, equity securities issued or to be issued, ownership percentage |  |  |  | 2.00% |  |  |
Notes rights offering, maximum aggregate principal amount of new secured notes |  |  | 119.4 |  |  |  |
Common shares outstanding | shares |  |  |  | 504,518,940 | 504,518,940 |  | 504,518,940
Protection payments |  |  |  | $ 104.0 | $ 81.0 |  |
Contractual interest on liabilities subject to compromise |  |  |  | 76.0 |  |  |
Bankruptcy claims, number claims filed | 1,597 |  |  |  |  |  |
Bankruptcy claims, amount of claims filed | $ 19,200.0 |  |  |  |  |  |
Debtor reorganization items, claims settlement accrual |  |  |  |  | 1,064.0 |  |
Loss on impairment of long lived assets |  |  |  | $ 414.0 | $ 696.0 |  |
Employee Stock Option [Member] | Employee Incentive Plan [Member] |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Plan of reorganization, share-based compensation arrangement, percentage of shares available for grant |  |  |  | 10.00% |  |  |
New Secured Notes [Member] |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Notes rights offering, pro rata equity securities issued or to be issued, ownership percentage |  |  |  |  |  | 57.50% |
Holders of General Unsecured Claims [Member] |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Payment for debt extinguishment |  |  | 17.0 |  |  |  |
Shipyards [Member] |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Payment for debt extinguishment |  |  | $ 17.0 |  |  |  |
NSNCo [Member] | New Secured Notes [Member] |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Plan of reorganization, debt securities issued or to be issued, value |  |  |  |  |  | $ 880.0 |
New Seadrill [Member] |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Plan of reorganization, percentage of equity securities issued or to be issued |  |  | 15.00% | 23.75% |  |  |
Plan of reorganization, equity securities issued or to be issued, ownership percentage |  |  | 2.00% |  |  |  |
Notes rights offering, pro rata equity securities issued or to be issued, ownership percentage |  |  | 57.50% |  |  |  |
Notes rights offering, maximum value of common shares issued |  | $ 48.1 |  |  |  |  |
Common shares outstanding | shares |  |  |  |  |  | 100,000,000 |
Equity method investment |  |  |  | $ 200.0 |  |  |
New Seadrill [Member] | New Secured Notes [Member] |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Plan of reorganization, percentage of equity securities issued or to be issued |  |  |  | 54.625% |  |  |
Plan of reorganization, debt securities issued or to be issued, value |  |  |  | $ 880.0 |  |  |
New Seadrill [Member] | Structuring Fees [Member] |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Plan of reorganization, percentage of equity securities issued or to be issued |  |  |  | 5.475% |  |  |
New Seadrill [Member] | Unsecured Claims And Debtor Affiliates [Member] |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Plan of reorganization, percentage of equity securities issued or to be issued |  |  |  | 14.25% |  |  |
New Seadrill [Member] | Existing Common Equity Interest Holder [Member] |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |
Plan of reorganization, percentage of equity securities issued or to be issued |  |  |  | 1.90% |  |  |
Exchange ratio of common shares |  |  |  | 0.0037345 |  |  |

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