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Preferred and Common Stockholder's Equity - Schedule of Anti-Dilutive Options and Restricted Stock Units Excluded from EPS Computation (Detail) - shares
shares in Millions
3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Equity [Abstract]    
Anti-dilutive options and RSU's excluded from EPS computation 1.5 9.6