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Stockholders' Equity - Common Stock (Details) - USD ($)
shares in Millions, $ in Billions
93 Months Ended
Feb. 02, 2015
Jun. 30, 2018
Class of Stock [Line Items]    
Number of shares issued (in shares) 108.6  
Common Stock    
Class of Stock [Line Items]    
Number of shares issued (in shares)   173.4
Value of common stock issued   $ 1.7