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Related Party Transactions - Summary of Dividends Paid (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Related Party Transaction [Line Items] |  |  |  |
Total amount paid | $ 44 | $ 43 | $ 87 | $ 87
Per common share (in dollars per share) | $ 0.50 | $ 0.50 | $ 1.00 |
Shares outstanding (in shares) | 86.8 | 86.8 |  |
Public Stockholders |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total amount paid | $ 8 | $ 7 | $ 15 |
IEP |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total amount paid | $ 36 | $ 36 | $ 72 |

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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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