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Fresh Start Accounting - Debt and Warrants (Details) - USD ($)	Sep. 30, 2021	Jun. 10, 2021	Feb. 09, 2021	Jun. 28, 2020
Debt Instrument [Line Items]
Implied stock price (in dollars per share)			$ 20.52
Expected volatility rate			58.00%
Expected dividend yield rate			0.00%
Debt			$ 1,313,000,000
Class A Warrants
Debt Instrument [Line Items]
Warrant, exercise price (in dollars per share)		$ 27.27	$ 27.63
Class B Warrants
Debt Instrument [Line Items]
Warrant, exercise price (in dollars per share)		31.71	32.13
Class C Warrants
Debt Instrument [Line Items]
Warrant, exercise price (in dollars per share)		$ 35.71	$ 36.18
5.5% senior notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	5.50%
Senior Notes | 5.5% senior notes due 2026
Debt Instrument [Line Items]
Debt instrument, principal amount			$ 500,000,000
Interest rate, stated percentage	0.055%		5.50%
Senior Notes | 5.875% senior notes due 2029
Debt Instrument [Line Items]
Debt instrument, principal amount			$ 500,000,000
Interest rate, stated percentage	0.05875%		5.875%
Term Loan | Debtor-in-Possession Credit Agreement
Debt Instrument [Line Items]
Debt				$ 1,179,000,000
Secured Debt | Debtor-in-Possession Credit Agreement
Debt Instrument [Line Items]
Exit credit facilities borrowing capacity				$ 750,000,000

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