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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2020
Jun. 30, 2020
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Treasury stock, shares 226,727,480 226,637,238
Common Class A    
Common stock, shares authorized 1,300,000,000 1,300,000,000
Common stock, shares issued 453,152,184 451,927,441
Common Class B    
Common stock, shares authorized 304,000,000 304,000,000
Common stock, shares issued 135,067,429 135,235,429
Common stock, shares outstanding 135,067,429 135,235,429