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Chapter 11 Proceedings and Ability to continue as a Going Concern - Emergence From Bankruptcy Plan Effects (Details) - USD ($)		1 Months Ended	12 Months Ended
	Dec. 13, 2019	Dec. 31, 2019	Dec. 31, 2020	Jun. 30, 2020	Dec. 12, 2019
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right	7,777,779			84,500,000
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 99.96	$ 99.96		$ 6.43
Common Stock
Stock Issued During Period, Shares, New Issues	69,999,954	0	0
Senior Notes [Member] \| Letter of Credit [Member]
Face amount of debt		$ 195,000,000
Exit Notes, 11.00 Percent Due 2024 [Member] \| Senior Notes [Member]
Debt and Lease Obligation					$ 2,100,000,000
Stated interest rate on debt		11.00%			11.00%
Face amount of debt					$ 2,100,000,000
ABL Credit Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity					$ 450,000,000