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Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 02, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Current portion of long-term debt: |  |  |
Current portion of long-term debt | $ 0 |  | $ 18
Non-current portion of long-term debt: |  |  |
Deferred debt issuance costs | (17) |  | (7)
Long-term debt | $ 1,813 |  | 1,237
1.125% Convertible Notes, net of unamortized discount |  |  |
Non-current portion of long-term debt: |  |  |
Percentage of contractual interest rate on notes | 1.125% |  |
4.375% Notes |  |  |
Non-current portion of long-term debt: |  |  |
Percentage of contractual interest rate on notes | 4.375% |  |
5.375% Notes |  |  |
Non-current portion of long-term debt: |  |  |
Percentage of contractual interest rate on notes | 5.375% |  |
4.875% Notes due 2025 |  |  |
Non-current portion of long-term debt: |  |  |
Percentage of contractual interest rate on notes | 4.875% |  |
Term loan facility | Term loan facility |  |  |
Current portion of long-term debt: |  |  |
Debt net of unamortized discount | $ 0 |  | 6
Non-current portion of long-term debt: |  |  |
Debt net of unamortized debt discount | 0 |  | 214
1.125% Convertible Notes, net of unamortized discount | 1.125% Convertible Notes, net of unamortized discount |  |  |
Current portion of long-term debt: |  |  |
Debt net of unamortized discount | $ 0 |  | $ 12
Non-current portion of long-term debt: |  |  |
Percentage of contractual interest rate on notes | 1.125% |  | 1.125%
Senior notes | 4.375% Notes |  |  |
Non-current portion of long-term debt: |  |  |
Debt net of unamortized debt discount | $ 800 |  | $ 0
Percentage of contractual interest rate on notes |  | 4.375% |
Senior notes | 5.375% Notes |  |  |
Non-current portion of long-term debt: |  |  |
Debt net of unamortized debt discount | $ 700 |  | 700
Percentage of contractual interest rate on notes | 5.375% |  |
Senior notes | 4.875% Notes due 2025 |  |  |
Non-current portion of long-term debt: |  |  |
Debt net of unamortized debt discount | $ 330 |  | $ 330
Percentage of contractual interest rate on notes | 4.875% |  |

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