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Related Party Transactions - Schedule of Related Party Transactions (Detail) - USD ($) | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Related Party Transaction [Line Items] |  |
Contingent consideration realized | $ (7,000,000) | $ (11,000,000)
Derivatives recharged to Seadrill Partners | 4,000,000 | (7,000,000)
Subsidiaries [Member] | Seadrill Partners LLC [Member] |  |
Related Party Transaction [Line Items] |  |
Intra group revenues | 35,000,000 | 37,000,000
Contingent consideration realized | 7,000,000 | 11,000,000
Rig operating costs charged by Seadrill Partners | (1,000,000) | (2,000,000)
Bareboat charter arrangements | 0 | 3,000,000
Interest expenses charged/recognized |  | 5,000,000
Related party inventory purchases | (3,000,000) | (2,000,000)
Derivatives recharged to Seadrill Partners |  | 1,000,000
Net related party income from Seadrill Partners | 46,000,000 | 73,000,000
Subsidiaries [Member] | Seadrill Partners LLC [Member] | Rig Operating Expenses Charged [Member] |  |
Related Party Transaction [Line Items] |  |
Other revenues | 1,000,000 | 13,000,000
Subsidiaries [Member] | Seadrill Partners LLC [Member] | Deferred Consideration Receivable [Member] |  |
Related Party Transaction [Line Items] |  |
Interest expenses charged/recognized | 2,000,000 | 2,000,000
Subsidiaries [Member] | Seadrill Partners LLC [Member] | Insurance Premiums Charged [Member] |  |
Related Party Transaction [Line Items] |  |
Other revenues | $ 5,000,000 | $ 5,000,000

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- Definition Costs incurred to operate and maintain an entities' wells and related equipment and facilities, including depreciation and applicable operating costs of support equipment and facilities and other costs of operating and maintaining those wells and related equipment and facilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=96866604&loc=d3e65139-109465 + Details
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