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Liabilities Subject to Compromise - Schedule of Liabilities Subject to Compromise (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Fresh-Start Adjustment [Line Items]
Liabilities subject to compromise	$ 9,050	$ 9,191
Senior under secured or impaired external debt [Member]
Fresh-Start Adjustment [Line Items]
Liabilities subject to compromise	5,266	5,371
Senior Unsecured Bonds [Member]
Fresh-Start Adjustment [Line Items]
Liabilities subject to compromise	2,334	2,334
New build global settlement agreement [Member]
Fresh-Start Adjustment [Line Items]
Liabilities subject to compromise	1,064	1,064
Derivative [Member]
Fresh-Start Adjustment [Line Items]
Liabilities subject to compromise	249	249
Accounts Payable And Other Liabilities [Member]
Fresh-Start Adjustment [Line Items]
Liabilities subject to compromise	84	103
Accrued Interest On Notes Payable [Member]
Fresh-Start Adjustment [Line Items]
Liabilities subject to compromise	49	50
Related Party Debt [Member]
Fresh-Start Adjustment [Line Items]
Liabilities subject to compromise	$ 4	$ 20

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Total amount of liabilities subject to compromise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56145-112766

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=64805424&loc=d3e55717-112764

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6918054&loc=d3e56015-112765

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