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Fair Value of Financial Instruments, Assets and Equity Investements (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Oct. 27, 2021	Sep. 30, 2021	Dec. 12, 2019
Senior Notes 6.5 Percent Due 2028
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate on debt		6.50%			6.50%
Senior Notes 8.625 Percent Due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate on debt				8.625%
Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 2,193		$ 2,372
Senior Notes \| Exit Notes, 11.00 Percent Due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate on debt						11.00%
Senior Notes \| Senior Notes 6.5 Percent Due 2028
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	482		488
Senior Notes \| Senior Notes 8.625 Percent Due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,586		1,584
Senior Notes \| Level 2 [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Long-term debt	2,154		2,499
Secured Debt \| Exit Notes, 11.00 Percent Due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	125
Secured Debt \| Level 2 [Member] \| Exit Notes, 11.00 Percent Due 2024 \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Long-term debt	128		311
Senior Notes 6.5 Percent Due 2028 \| Level 2 [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Long-term debt	482		528
Senior Notes 8.625 Percent Due 2030 \| Level 2 [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value of Long-term debt	$ 1,544		$ 1,660