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Fair Value Measurements - Details of Long-Term Debt (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 06, 2017
--- | --- | --- | ---
1.125% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate on Notes | 1.125% |  |
Senior Notes | 5.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate on Notes | 5.375% |  |
Senior Notes | 4.875% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate on Notes | 4.875% |  | 4.875%
Convertible Notes | 1.125% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate on Notes | 1.125% | 1.125% |
Convertible Notes | 1.625% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate on Notes | 1.625% |  |
Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | $ 1,502 | $ 1,970 |
Carrying Amount | Senior Notes | 5.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 693 | 692 |
Carrying Amount | Senior Notes | 4.875% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 326 | 325 |
Carrying Amount | Convertible Notes | 1.125% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 420 | 496 |
Carrying Amount | Convertible Notes | 1.625% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 63 | 157 |
Carrying Amount | Credit Facility |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 0 | 300 |
Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 2,232 | 2,631 |
Fair Value | Senior Notes | 5.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 706 | 730 |
Fair Value | Senior Notes | 4.875% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 320 | 329 |
Fair Value | Convertible Notes | 1.125% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 1,099 | 1,052 |
Fair Value | Convertible Notes | 1.625% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 107 | 220 |
Fair Value | Credit Facility |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of debt | 0 | 300 |
Current liabilities: Derivative liability | 1.125% Conversion Option |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative liabilities | $ 657 | $ 522 |

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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109247956&loc=SL51823488-111719 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details
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