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Stockholders' Equity Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jun. 24, 2015
Dec. 31, 2014
Equity [Abstract]        
Stockholders' Equity Note, Stock Split 1.333      
Common Stock, Shares Authorized 1,000,000,000 1,000,000,000 1,000,000,000.0 200,000,000.0
Preferred Stock, Shares Authorized 100 100 100,000,000.0 0
Gains (Losses) on Extinguishment of Debt   $ 34    
Initial Public Offering Shares   34,000,000    
Underwriter Option Shares   4,431,818    
Shares Issued, Price Per Share $ 22.50 $ 22.50