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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-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 inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Debt including Capital Lease Obligations - Retiring of Credit Facility and 7.5% Senior Notes (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Feb. 28, 2013	Dec. 31, 2014	Dec. 31, 2013	Feb. 05, 2013
7.5% Senior Notes due 2014 \| Senior Notes [Member]
Extinguishment of Debt [Line Items]
Stated interest rate on debt instrument	7.50%
7.5% Senior Notes due 2014 \| Loss on debt extinguishment \| Line of credit facility
Extinguishment of Debt [Line Items]
Write off of deferred financing costs	$ 5
7.5% Senior Notes due 2014 \| Loss on debt extinguishment \| Senior Notes [Member]
Extinguishment of Debt [Line Items]
Write off of deferred financing costs	1
7.5% Senior Notes due 2014 and Credit Facility \| Loss on debt extinguishment \| Senior notes and line of credit
Extinguishment of Debt [Line Items]
Write off of deferred financing costs	6
Senior Notes [Member] \| 7.875% Senior Secured Notes due 2021
Extinguishment of Debt [Line Items]
Net proceeds from issuance of senior notes	$ 457
Stated interest rate on debt instrument	7.875%	7.875%	7.875%	7.875%