Number of new stock issued during the period.

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Name:	us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Chapter 11 Proceedings and Ability to continue as a Going Concern - Emergence From Bankruptcy Plan Effects (Details) - USD ($) $ in Millions		1 Months Ended
	Dec. 13, 2019	Dec. 31, 2019	Dec. 12, 2019	Jun. 30, 2019	Dec. 31, 2018
Debt and Lease Obligation		$ 2,161			$ 7,662
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right		7,777,779		84,500,000
Common Stock
Stock Issued During Period, Shares, New Issues	70,000,000	69,999,954
Exit Notes, 11.00 Percent Due 2024 [Member] \| Senior Notes [Member]
Debt and Lease Obligation			$ 2,097		$ 0