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Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 06, 2017
--- | --- | --- | ---
Current portion of long-term debt: |  |  |
Lease financing obligations | $ 1 | $ 1 |
Debt issuance costs | (2) | (4) |
Current portion of long-term debt | 484 | 653 |
Non-current portion of long-term debt: |  |  |
Debt issuance costs | (11) | (12) |
Senior notes | 1,019 | 1,318 |
Lease financing obligations | 198 | 198 |
Total debt | $ 1,701 | 2,169 |
1.125% Convertible Notes |  |  |
Non-current portion of long-term debt: |  |  |
Percentage of contractual interest rate on Notes | 1.125% |  |
Convertible Notes | 1.125% Convertible Notes |  |  |
Current portion of long-term debt: |  |  |
Debt net of unamortized discount | $ 422 | $ 499 |
Non-current portion of long-term debt: |  |  |
Percentage of contractual interest rate on Notes | 1.125% | 1.125% |
Convertible Notes | 1.625% Convertible Notes |  |  |
Current portion of long-term debt: |  |  |
Debt net of unamortized discount | $ 63 | $ 157 |
Non-current portion of long-term debt: |  |  |
Percentage of contractual interest rate on Notes | 1.625% |  |
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 |  |  |
Non-current portion of long-term debt: |  |  |
Debt net of unamortized debt discount | $ 330 | 330 |
Percentage of contractual interest rate on Notes | 4.875% |  | 4.875%
Credit Facility |  |  |
Non-current portion of long-term debt: |  |  |
Debt net of unamortized debt discount | $ 0 | $ 300 |

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- Definition Amount of capital lease obligation due within one year or the normal operating cycle, if longer. + 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(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45023-112735 + Details
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