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v3.19.3.a.u2

Fair Value Measurements - Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated fair values of long-term debt | $ 1,255 | $ 1,260
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated fair values of long-term debt | $ 1,347 | 1,707
5.375% Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Percentage of contractual interest rate | 5.375% |
4.875% Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Percentage of contractual interest rate | 4.875% |
1.125% Convertible Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Percentage of contractual interest rate | 1.125% |
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 | $ 696 | 694
Senior Notes | 5.375% Notes | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated fair values of long-term debt | $ 745 | 674
Senior Notes | 4.875% Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Percentage of contractual interest rate | 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 | $ 327 | 326
Senior Notes | 4.875% Notes | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated fair values of long-term debt | $ 340 | 301
Senior Notes | 1.125% Convertible Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Percentage of contractual interest rate | 1.125% |
Term Loan Facility | Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated fair values of long-term debt | $ 220 | 0
Term Loan Facility | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated fair values of long-term debt | $ 220 | 0
1.125% Convertible Notes | 4.875% Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Percentage of contractual interest rate | 4.875% |
1.125% Convertible Notes | 1.125% Convertible Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Percentage of contractual interest rate | 1.125% |
1.125% Convertible Notes | 1.125% Convertible Notes | Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated fair values of long-term debt | $ 12 | 240
1.125% Convertible Notes | 1.125% Convertible Notes | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated fair values of long-term debt | $ 42 | 732
1.125% Conversion Option |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Percentage of contractual interest rate on derivative | 1.125% |
1.125% Conversion Option |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
1.125% Conversion Option derivative liability | $ 29 | $ 476
Percentage of contractual interest rate on derivative | 1.125% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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