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Long-term Debt Schedule of Long-term Debt (Details) - USD ($) $ in Millions	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	$ 13		$ 13
Long-term Debt and Lease Obligation	2,601		2,151
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	2,098		$ 2,097
Senior Notes [Member] \| Exit Notes, 11.00 Percent Due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			11.00%	11.00%
Senior Notes [Member] \| Senior Notes 8.75 Percent Due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.75%
Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	455		$ 0
Other short-term bank loans [Member]
Debt Instrument [Line Items]
Finance Lease, Liability, Noncurrent	48		54
Other short-term bank loans [Member]
Debt Instrument [Line Items]
Finance Lease, Liability, Current	9		10
Short-term Debt	$ 4		$ 3