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Subsequent Events - (Details) - Subsequent Event - USD ($)
$ / shares in Units, $ in Millions
Dec. 28, 2018
Nov. 07, 2018
Oct. 29, 2018
Subsequent Event [Line Items]      
Common stock dividends (in dollars per share)   $ 0.175  
Scenario, Forecast | Alpha      
Subsequent Event [Line Items]      
Total purchase consideration $ 750    
Portion of purchase consideration payable in cash 650    
Portion of purchase consideration payable in Company's shares $ 100    
Minimum      
Subsequent Event [Line Items]      
Business Combination, Estimated Closing Period     30 days
Maximum      
Subsequent Event [Line Items]      
Business Combination, Estimated Closing Period     60 days