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Borrowings and Other Obligations Fair and carrying value of long-term debt (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Aug. 04, 2020	Dec. 12, 2019
Exit Notes, 11.00 Percent Due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$ 300	$ 300
Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	489	488
Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	300	300
Senior Notes \| Senior Notes 8.625 Percent Due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	1,584	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%
Long-term Debt \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	2,373	2,372
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	311	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	516	528
Fair Value, Inputs, Level 2 \| Senior Notes \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	1,628	1,660
Fair Value, Inputs, Level 2 \| Long-term Debt \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 2,455	$ 2,499