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Debt - 2014 Senior Notes (Details) - 2014 Senior Notes - USD ($)	Oct. 06, 2014	Dec. 31, 2017
The 2022 Notes
Debt
Principal amount	$ 800,000,000
Interest rate (as a percent)	5.75%
Fair value of debt instrument		$ 834,000,000
The 2024 Notes
Debt
Principal amount	$ 800,000,000
Interest rate (as a percent)	5.875%
Fair value of debt instrument		$ 866,000,000
The 2024 Notes | Prior to July 15 2024
Debt
Redemption price equal to principal amount (in percent)	100.00%
The 2024 Notes | On or after July 15, 2024
Debt
Redemption price equal to principal amount (in percent)	100.00%

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
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Contractual interest rate for funds borrowed, under the debt agreement.

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-Topic 210
-SubTopic 10
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