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Borrowings and Other Obligations Fair and carrying value of long-term debt (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Aug. 04, 2020	Dec. 12, 2019
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 2,325	$ 2,372
Exit Notes, 11.00 Percent Due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	250	300
Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	490	488
Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	250
Senior Notes \| Senior Notes 8.625 Percent Due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,585	1,584
Debt Instrument, Interest Rate, Stated Percentage				8.625%
Senior Notes \| Exit Notes, 11.00 Percent Due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					11.00%
Senior Notes \| Senior Notes 8.75 Percent Due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			8.75%
Fair Value, Inputs, Level 2 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	2,114	2,499
Fair Value, Inputs, Level 2 \| Exit Notes, 11.00 Percent Due 2024 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	255	311
Fair Value, Inputs, Level 2 \| Secured Debt \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	456	528
Fair Value, Inputs, Level 2 \| Senior Notes \| Fair Value \| Senior Notes 8.625 Percent Due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 1,403	$ 1,660