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Fair Value Measurements - Details of Long-Term Debt (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | --- | ---
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% |  | 5.375% |  |
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% |  |  | 1.625% |
Carrying Value |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of debt | $ 1,455 | $ 1,446 |  |  |
Carrying Value | Senior Notes | 5.375% Notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of debt | 691 | 691 |  |  |
Carrying Value | Convertible Notes | 1.125% Convertible Notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of debt | 477 | 471 |  |  |
Carrying Value | Convertible Notes | 1.625% Convertible Notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of debt | 287 | 284 |  |  |
Fair Value |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of debt | 1,752 | 1,850 |  |  |
Fair Value | Senior Notes | 5.375% Notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of debt | 726 | 714 |  |  |
Fair Value | Convertible Notes | 1.125% Convertible Notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of debt | 705 | 792 |  |  |
Fair Value | Convertible Notes | 1.625% Convertible Notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair value of debt | $ 321 | $ 344 |  |  |

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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=73719730&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=73719730&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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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