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Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Lease financing obligations | $ 0 | $ 1
Debt issuance costs | 0 | (1)
Total, current portion | 18 | 241
Debt issuance costs | (7) | (10)
Total, non-current portion | $ 1,237 | 1,020
1.125% Convertible Notes |  |
Debt Instrument [Line Items] |  |
Percentage of contractual interest rate | 1.125% |
5.375% Notes |  |
Debt Instrument [Line Items] |  |
Percentage of contractual interest rate | 5.375% |
4.875% Notes |  |
Debt Instrument [Line Items] |  |
Percentage of contractual interest rate | 4.875% |
Convertible Debt | 1.125% Convertible Notes |  |
Debt Instrument [Line Items] |  |
Percentage of contractual interest rate | 1.125% |
Current portion of long-term debt | $ 12 | 241
Convertible Debt | 4.875% Notes |  |
Debt Instrument [Line Items] |  |
Percentage of contractual interest rate | 4.875% |
Senior Notes | 1.125% Convertible Notes |  |
Debt Instrument [Line Items] |  |
Percentage of contractual interest rate | 1.125% |
Senior Notes | 5.375% Notes |  |
Debt Instrument [Line Items] |  |
Percentage of contractual interest rate | 5.375% |
Non-current portion of long-term debt | $ 700 | 700
Senior Notes | 4.875% Notes |  |
Debt Instrument [Line Items] |  |
Percentage of contractual interest rate | 4.875% |
Non-current portion of long-term debt | $ 330 | 330
Term Loan Facility | Term Loan Facility |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | 6 | 0
Non-current portion of long-term debt | $ 214 | $ 0

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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/otherTransitionRef -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 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -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/otherTransitionRef -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 + Details
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