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Fresh Start Accounting Reorganization Adjustments - Narrative (Details) - USD ($) $ in Millions	Mar. 01, 2020	Sep. 30, 2019	Jul. 01, 2019
Fresh-Start Adjustment [Line Items]
Debtor reorganization item, equity backstop		$ 24
Repayment of DIP Term Loan interest			$ (5)
Reorganization Adjustments, Escrow Cash Receivable			3
Release of utility deposit			1
Repayment of DIP Term Loan Facility			(350)
Reorganization Items, Current Portion of Secured Debt			7
Debtor reorganization items, debt backstop		$ 80
Financing fees			(19)
Reorganization Items, Other Current Liabilities			12
Other professional fees			(26)
Reorganization Items, Secured Term Loan			1,208
Reorganization Items, Secured Notes			450
Debt Instrument, Unamortized Discount			12
Reorganization Items, Debt Issuance Costs Paid			17
Liabilities Subject to Compromise, Long-term liabilities			(32)
Fresh-start Adjustment, Increase/Decrease Reorganization Tax Items			40
Entity Common Stock, Shares Outstanding	100
Reorganization Adjustments [Member]
Fresh-Start Adjustment [Line Items]
Repayment of DIP Term Loan interest			$ (5)