Borrowings and Other Debt Obligations (Details) - USD ($) $ in Millions	Jan. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Oct. 27, 2021	Dec. 12, 2019
Debt Instrument [Line Items]
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Other Liabilities, Current		Other Liabilities, Current
Finance Lease, Liability, Current		$ 17		$ 14
Current Portion of Long-term Debt		$ 168		$ 45
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Other Non-current Liabilities		Other Non-current Liabilities
Finance Lease, Liability, Noncurrent		$ 36		$ 41
Long-term Debt		1,715		2,203
Senior Notes 6.5 Percent Due 2028
Debt Instrument [Line Items]
Stated interest rate on debt			6.50%		6.50%
Face amount of debt					$ 500
Senior Notes 6.5 Percent Due 2028 | Subsequent Event
Debt Instrument [Line Items]
Face amount of debt	$ 97
Senior Notes 8.625 Percent Due 2030
Debt Instrument [Line Items]
Stated interest rate on debt						8.625%
Face amount of debt				1,600		$ 1,600
Senior Notes
Debt Instrument [Line Items]
Long-term Debt, Current Maturities		0		20
Senior Notes | Exit Notes, 11.00 Percent Due 2024
Debt Instrument [Line Items]
Stated interest rate on debt							11.00%
Long-term debt		0		105
Face amount of debt							$ 2,100
Senior Notes | Senior Notes 6.5 Percent Due 2028
Debt Instrument [Line Items]
Long-term Debt, Current Maturities		151		11
Long-term debt		92		471
Senior Notes | Senior Notes 8.625 Percent Due 2030
Debt Instrument [Line Items]
Long-term debt		$ 1,587		$ 1,586