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Marketable Securities - Marketable Securities In The Consolidated Balance Sheet (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Marketable Securities [Line Items] |  |
Total marketable securities | $ 121 | $ 124
Seadrill Partners Common Units [Member] |  |
Marketable Securities [Line Items] |  |
Total marketable securities | 91 | 96
Archer [Member] |  |
Marketable Securities [Line Items] |  |
Total marketable securities | $ 30 | $ 28

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- Definition Marketable Securities [Line Items] + References No definition available. + Details
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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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