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Borrowings and Other Debt Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Oct. 27, 2021	Sep. 30, 2021	Aug. 28, 2020	Dec. 12, 2019
Debt Instrument [Line Items]
Short-term Borrowings and Current Portion of Long-term Debt	$ 45		$ 12
Long-term Debt and Lease Obligation	2,203		2,416
Senior Notes 6.5 Percent Due 2028
Debt Instrument [Line Items]
Stated interest rate on debt		6.50%			6.50%
Senior Notes 8.625 Percent Due 2030
Debt Instrument [Line Items]
Stated interest rate on debt				8.625%
Senior Notes
Debt Instrument [Line Items]
Short-term Borrowings and Current Portion of Long-term Debt	20		0
Senior Notes \| Exit Notes, 11.00 Percent Due 2024
Debt Instrument [Line Items]
Stated interest rate on debt							11.00%
Long-term debt	105
Senior Notes \| Senior Notes 8.75 Percent Due 2024
Debt Instrument [Line Items]
Stated interest rate on debt						8.75%
Senior Notes \| Senior Notes 6.5 Percent Due 2028
Debt Instrument [Line Items]
Short-term Borrowings and Current Portion of Long-term Debt	11		0
Long-term debt	471		488
Senior Notes \| Senior Notes 8.625 Percent Due 2030
Debt Instrument [Line Items]
Long-term debt	1,586		1,584
Secured Debt \| Exit Notes, 11.00 Percent Due 2024
Debt Instrument [Line Items]
Long-term debt			300
Other short-term bank loans [Member]
Debt Instrument [Line Items]
Finance Lease, Liability, Noncurrent	41		44
Other short-term bank loans [Member]
Debt Instrument [Line Items]
Finance Lease, Liability, Current	$ 14		$ 12