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Debt - Senior Notes and Convertible Senior Notes (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Debt, principal | $ 9,095,000,000 | $ 8,916,000,000
Minimum | Convertible debt |  |
Debt Instrument [Line Items] |  |
Debt, principal | 50,000,000 |
Maximum | Convertible debt |  |
Debt Instrument [Line Items] |  |
Debt, principal | $ 75,000,000 |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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