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DEBT - Note Repurchases (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Second Lien Notes and 6% Senior Notes due 2024
Repurchases of debt
Repurchase value of the principal amounts	$ 30	$ 149
Pre-tax gain on extinguishment of debt, net of a reduction in deferred issuance costs	2	26
Second Lien Notes (Second Priority Lien)
Repurchases of debt
Principal amount of debt reduction through payment or repurchase	$ 31	$ 128
Debt instrument interest rate stated percentage	8.00%	8.00%	8.00%
Senior Notes (Unsecured) | 6% Senior Notes due 2024
Repurchases of debt
Principal amount of debt reduction through payment or repurchase	$ 1	$ 49
Debt instrument interest rate stated percentage	6.00%	6.00%	6.00%

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- Definition

Face (par) amount of the original debt instrument that was repurchased during the period.

+ References

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
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