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Related Party Transactions - Agency Arrangement With IEP (Details) - USD ($) $ in Millions |  | 9 Months Ended
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Feb. 04, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Related Party Transaction [Line Items] |  |  |
Investment in certain marketable securities |  | $ 140 | $ 0
Agency Agreement with IEP | IEH |  |  |
Related Party Transaction [Line Items] |  |  |
Investment in certain marketable securities | $ 140 |  |

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- Definition Amount of cash outflow for purchase of marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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