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Share-Based Compensation (Schedule of All Transactions Related to Performance Share Units Under the Plans) (Details) - $ / shares
shares in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Performance Share Units    
Canceled and forfeited (in shares)   0.0
Performance Share Units    
Performance Share Units    
Nonvested at beginning of period (in shares) 0.6 0.8
Granted (in shares) 0.2 0.2
Vested (in shares) (0.2) (0.4)
Canceled and forfeited (in shares) (0.2) 0.0
Nonvested at end of period (in shares) 0.4 0.6
Weighted-Average Grant Date Fair Value per Share    
Nonvested at beginning of period (in usd per share) $ 77.83 $ 63.96
Granted (in usd per share) 66.43 83.19
Vested (in usd per share) 71.57 51.49
Canceled and forfeited (in usd per share) 0.00 0.00
Nonvested at end of period (in usd per share) $ 66.13 $ 77.83
Target performance goal (as a percent) 133.00% 170.00%