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Fair Value Measurements - Debt Financing (Details) - USD ($) $ in Billions | Sep. 30, 2020 | Dec. 31, 2019
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Book Value |  |
Financial Instruments Not Measured at Fair Value |  |
Debt financing | $ 15.4 | $ 13.7
Level 2 |  |
Financial Instruments Not Measured at Fair Value |  |
Debt financing | $ 15.5 | $ 14.1

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + Details
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