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Supplementary Cash Flow Information - Non-cash Investing and Financing Activities (Parenthetical) (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Schedule of Supplemental Cash Flow Elements [Line Items] |  |
Sale of rigs and equipment | $ 126 | $ 76
Repayment of debt following sale of rigs and equipment |  | (74)
Dividend to non-controlling interests in VIEs |  | (14)
West Triton and West Resolute [Member] | Drilling Unit [Member] |  |
Schedule of Supplemental Cash Flow Elements [Line Items] |  |
Sale of rigs and equipment |  | 76
Fair value of consideration received |  | 150
Repayment of debt following sale of rigs and equipment |  | (74)
Variable Interest Entity, Primary Beneficiary [Member] |  |
Schedule of Supplemental Cash Flow Elements [Line Items] |  |
Dividend to non-controlling interests in VIEs |  | $ (14)

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- Definition Noncash financing activities, Repayment of debt. + References No definition available. + Details
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