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Related Party Transactions - Summary of Dividends Paid (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Related Party Transaction [Line Items]
Total amount paid	$ 75	$ 44	$ 43	$ 162	$ 130
Per common share (in dollars per share)	$ 0.75	$ 0.50	$ 0.50	$ 1.75
Shares outstanding (in shares)	100.6	86.8	86.8
Public Stockholders
Related Party Transaction [Line Items]
Total amount paid	$ 22	$ 8	$ 7	$ 37
IEP
Related Party Transaction [Line Items]
Total amount paid	$ 53	$ 36	$ 36	$ 125

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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-Publisher FASB
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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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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.

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