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Fair Value Measurements - Long-term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Jun. 06, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 1,970 |  | $ 1,446
Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 2,631 |  | 1,850
5.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 5.375% |  |
1.125% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 1.125% |  |
4.875% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 4.875% |  |
1.625% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 1.625% |  |
Senior Notes | 5.375% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 5.375% |  |
Senior Notes | 5.375% Notes | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 692 |  | 691
Senior Notes | 5.375% Notes | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 730 |  | 714
Senior Notes | 4.875% Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 4.875% | 4.875% |
Senior Notes | 4.875% Notes | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 325 |  | 0
Senior Notes | 4.875% Notes | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 329 |  | 0
Convertible Debt | 1.125% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 1.125% |  |
Convertible Debt | 1.125% Convertible Notes | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 496 |  | 471
Convertible Debt | 1.125% Convertible Notes | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 1,052 |  | 792
Convertible Debt | 1.625% Convertible Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percentage of contractual interest rate | 1.625% |  |
Convertible Debt | 1.625% Convertible Notes | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 157 |  | 284
Convertible Debt | 1.625% Convertible Notes | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | 220 |  | 344
Credit Facility | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | 300 |  | 0
Credit Facility | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated fair values of long-term debt | $ 300 |  | $ 0

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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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 + Details
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