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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

X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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