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General Information - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2018 Option	Jul. 02, 2018 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of offshore drilling units owned by the Company	35
Number of offshore drilling units under construction	8
Number of options to acquire semi-submersible rig | Option	1
New capital		$ 1,080
Unsecured bond obligation		2,400
Unsecured interest rate and currency swaps		250
Post emergence cash		2,100
Outstanding debt principal		$ 7,600

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Number Of Off shore Drilling Unit Under Construction

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Number of offshore drilling units owned

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Number Of Semi Submersible Rigs Under Option To Acquire

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Post emergence cash.

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Unsecured interest rate and currency swaps.

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This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107314-111719

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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