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Related Party Transactions - Receivables (Payables) with Seadrill Partners (Parenthetical) (Detail) - West Vencedor Loan Agreement [Member] - USD ($) $ in Millions | Apr. 14, 2015 | Dec. 31, 2017 | Jun. 30, 2015
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Rig Financing and Loan Agreements [Member] | Ship Finance International Ltd VIEs [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Due from related parties |  | $ 25 |
Seadrill Partners LLC [Member] | Secured Debt [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Balloon payment to be paid | $ 21 |  | $ 70
Basis spread on variable rate (as percent) | 2.30% |  |
Guarantee fee percentage (as percent) | 1.40% |  |

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