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Loss on Disposals and Contingent Consideration - Additional Information (Detail) - USD ($) |  | 6 Months Ended | 36 Months Ended | 44 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 29, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 19, 2015 | Nov. 04, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Loss on disposals |  |  | $ (166,000,000) |  |  |  |
Contingent consideration realized |  | $ 7,000,000 | $ 11,000,000 |  |  |  |
Seadrill Operating LP [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  | 42.00% |
Contingent consideration arrangements, description |  | In relation to the sale, we may be entitled to receive a contingent consideration from Seadrill Partners, consisting of (a) any day rates earned by Seadrill Partners in excess of $450,000 per day, adjusted for daily utilization, tax and agency commission for the remainder of the ExxonMobil contract, which completed in December 2017 and (b) 50% of any day rate earned above $450,000 per day, adjusted for daily utilization, tax and agency commission fee after December 2017 until 2025. |  |  |  |  |
Amount to be paid under contingent consideration arrangements, value, low |  | $ 450,000 |  | $ 450,000 | $ 450,000 |  |
West Triton West Mischief and West Resolute [Member] | Drilling Unit [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Fair value of consideration received | $ 225,000,000 |  |  |  |  |  |
Loss on disposals | $ (166,000,000) |  |  |  |  |  |
West Polaris [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Contingent consideration realized |  |  |  | $ 53,000,000 |  |  |
West Vela [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Ownership interest (as percent) |  |  |  |  |  |  | 49.00%
Contingent consideration realized |  |  |  |  | $ 45,000,000 |  |
West Vela [Member] | Maximum [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Fair value of consideration received |  |  |  |  |  |  | $ 40,000

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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents a description of such arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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