Reorganization - Schedule of Reorganization Items (Detail) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($)
Reorganization [Line Items]
Total reorganization items, net	$ 246
Debtor in Possession [Member]
Reorganization [Line Items]
Claims valuation adjustments	96
DIP Credit Facility fees	87
Professional fees and other	63
Total reorganization items, net	$ 246

Amount of reorganization items related to legal and advisory professional fees related to entities in bankruptcy.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 45
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=116635682&loc=d3e55730-112764

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration