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Segment Information - Summary of Geographic Segment Data (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | $ 712 | $ 1,146 |
Brazil [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 188 | 197 |
NORWAY |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 82 | 115 |
UNITED STATES |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 30 | 187 |
Others [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 128 | 208 |
NIGERIA [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 105 | 110 |
ANGOLA |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 100 | 249 |
SAUDI ARABIA |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue | 79 | $ 80 |
Drilling Unit [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Fixed assets | 12,531 |  | $ 13,216
Drilling Unit [Member] | Brazil [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Fixed assets | 2,405 |  | 1,816
Drilling Unit [Member] | NORWAY |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Fixed assets | 2,331 |  | 2,258
Drilling Unit [Member] | MALAYSIA |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Fixed assets | 1,445 |  | 1,809
Drilling Unit [Member] | SPAIN |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Fixed assets | 1,344 |  | 2,016
Drilling Unit [Member] | UNITED STATES |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Fixed assets | 1,239 |  | 1,266
Drilling Unit [Member] | Others [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Fixed assets | $ 3,767 |  | $ 4,051

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