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Borrowings and Other Debt Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Oct. 27, 2021	Sep. 30, 2021	Dec. 31, 2020	Aug. 04, 2020	Dec. 31, 2019	Dec. 12, 2019
Debt Instrument [Line Items]
Short-term Borrowings and Current Portion of Long-term Debt	$ 12			$ 13
Long-term debt	2,372			2,553
Long-term Debt and Lease Obligation	$ 2,416			2,601
Senior Notes 6.5 Percent Due 2028
Debt Instrument [Line Items]
Stated interest rate on debt			6.50%
Senior Notes 8.625 Percent Due 2030
Debt Instrument [Line Items]
Stated interest rate on debt		8.625%
LC Credit Agreement [Member]
Debt Instrument [Line Items]
Letter Of Credit Fee Percentage	0.125%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.50%
LC Credit Agreement [Member] \| LIBOR
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.50%
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt	$ 300			2,098
Senior Notes [Member] \| Exit Notes, 11.00 Percent Due 2024 [Member]
Debt Instrument [Line Items]
Stated interest rate on debt						11.00%	11.00%
Senior Notes [Member] \| Senior Notes 8.75 Percent Due 2024
Debt Instrument [Line Items]
Stated interest rate on debt					8.75%
Senior Notes [Member] \| Senior Notes 6.5 Percent Due 2028
Debt Instrument [Line Items]
Stated interest rate on debt					6.50%
Long-term debt	488			0
Senior Notes [Member] \| Senior Notes 8.625 Percent Due 2030
Debt Instrument [Line Items]
Stated interest rate on debt					8.625%
Long-term debt	1,584			0
Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt	0			455
Other short-term bank loans [Member]
Debt Instrument [Line Items]
Finance Lease, Liability, Noncurrent	44			48
Other short-term bank loans [Member]
Debt Instrument [Line Items]
Finance Lease, Liability, Current	12			9
Short-term Debt	$ 0			$ 4