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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
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