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Debt Obligations Fair Value of Debt (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Debt Disclosure [Abstract] |  |
Debt Instrument, Fair Value Disclosure | $ 3,700 | $ 3,110

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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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