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Short and Long-Term Debt Debt Transactions (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023		Aug. 24, 2023	Dec. 31, 2022
Schedule of Total Indebtedness [Line Items]
Long-term Debt, Gross	$ 2,587
7.00% Senior Secured Second Lien Notes | Secured Debt
Schedule of Total Indebtedness [Line Items]
Long-term Debt, Gross	$ 640		$ 640	$ 0
Interest Rate	7.00%		7.00%
7.00% Senior Secured Second Lien Notes | Secured Debt | Significant Noteholder Exchange
Schedule of Total Indebtedness [Line Items]
Long-term Debt, Gross			$ 218
7.00% Senior Secured Second Lien Notes | Secured Debt | Exchange Offers
Schedule of Total Indebtedness [Line Items]
Long-term Debt, Gross			422
5.75% Senior Notes | Senior Notes
Schedule of Total Indebtedness [Line Items]
Long-term Debt, Gross	$ 576	[1]		900
Interest Rate	5.75%
Debt Instrument, Repurchase Amount			298
Principal Amount of Debt Repurchased	$ 26
5.75% Senior Notes | Senior Notes | Significant Noteholder Exchange
Schedule of Total Indebtedness [Line Items]
Debt Instrument, Repurchase Amount			55
5.75% Senior Notes | Senior Notes | Exchange Offers
Schedule of Total Indebtedness [Line Items]
Debt Instrument, Repurchase Amount			243
5.25% Senior Notes | Senior Notes
Schedule of Total Indebtedness [Line Items]
Long-term Debt, Gross	$ 457	[1]		$ 1,000
Interest Rate	5.25%
Debt Instrument, Repurchase Amount			503
Principal Amount of Debt Repurchased	$ 40
5.25% Senior Notes | Senior Notes | Significant Noteholder Exchange
Schedule of Total Indebtedness [Line Items]
Debt Instrument, Repurchase Amount			218
5.25% Senior Notes | Senior Notes | Exchange Offers
Schedule of Total Indebtedness [Line Items]
Debt Instrument, Repurchase Amount			285
5.75% Senior Notes and 5.25% Senior Notes | Senior Notes
Schedule of Total Indebtedness [Line Items]
Principal Amount of Debt Repurchased	$ 48
5.75% Senior Notes and 5.25% Senior Notes | Senior Notes | Significant Noteholder Exchange
Schedule of Total Indebtedness [Line Items]
Debt Instrument, Repurchase Amount			$ 273
[1] See below under the headers "Debt Exchange Transactions" and "7.00% Senior Secured Second Lien Notes" for additional information with respect to the debt exchange transactions, as well as, under the header "Open Market Repurchases of 5.75% and 5.25% Senior Notes" for additional information with respect to open market repurchases in the third quarter of 2023.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
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Contractual interest rate for funds borrowed, under the debt agreement.

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

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