Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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Borrowings and Other Obligations Fair and carrying value of long-term debt (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Oct. 27, 2021	Sep. 30, 2021	Dec. 12, 2019
Exit Notes, 11.00 Percent Due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	$ 0	$ 125
Senior Notes 6.5 Percent Due 2028
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	317	482
Senior Notes 8.625 Percent Due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	1,587	1,586
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	1,904	2,193
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 6.5 Percent Due 2028
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				6.50%
Senior Notes \| Senior Notes 8.625 Percent Due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			8.625%
Fair Value, Inputs, Level 2 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,935	2,154
Fair Value, Inputs, Level 2 \| Secured Debt \| Fair Value \| Senior Notes 6.5 Percent Due 2028
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	323	482
Fair Value, Inputs, Level 2 \| Senior Notes \| Fair Value \| Exit Notes, 11.00 Percent Due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	128
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]
Fair Value	$ 1,612	$ 1,544