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Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017 | Jun. 06, 2017
--- | --- | --- | ---
Current portion of long-term debt: |  |  |
Lease financing obligations | $ 1 | $ 1 |
Debt issuance costs | (1) | (4) |
Current portion of long-term debt | 296 | 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 | $ 1,513 | 2,169 |
1.125% Notes |  |  |
Non-current portion of long-term debt: |  |  |
Percentage of contractual interest rate on Notes | 1.125% |  |
Unamortized discount | $ 18 | 51 |
1.625% Notes (2) |  |  |
Non-current portion of long-term debt: |  |  |
Unamortized discount |  | 3 |
Convertible Notes | 1.125% Notes |  |  |
Current portion of long-term debt: |  |  |
Debt net of unamortized discount | $ 296 | $ 499 |
Non-current portion of long-term debt: |  |  |
Percentage of contractual interest rate on Notes | 1.125% | 1.125% |
Convertible Notes | 1.625% Notes (2) |  |  |
Current portion of long-term debt: |  |  |
Debt net of unamortized discount | $ 0 | $ 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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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date. + References Reference 1: 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 2: 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 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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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