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Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Jan. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Percentage of contractual interest rate | 4.875% |  |
Total (1) | $ 0 |  | $ 18
Less: debt issuance costs | (23) |  | (7)
Total | $ 2,127 |  | $ 1,237
Convertible Debt | 1.125% Convertible Notes |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of contractual interest rate | 1.125% | 1.125% | 1.125%
Current portion of long-term debt | $ 0 | $ 12 | $ 12
Convertible Debt | 4.875% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of contractual interest rate | 4.875% |  |
Term loan facility | Term loan facility |  |  |
Debt Instrument [Line Items] |  |  |
Current portion of long-term debt | $ 0 |  | 6
Non-current portion of long-term debt | $ 0 |  | 214
Senior Notes | 4.375% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of contractual interest rate | 4.375% |  |
Non-current portion of long-term debt | $ 800 |  | 0
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 | 3.875% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of contractual interest rate | 3.875% |  |
Non-current portion of long-term debt | $ 650 |  | 0
Senior Notes | 4.875% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of contractual interest rate | 4.875% |  |
Non-current portion of long-term debt | $ 0 |  | $ 330

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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=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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