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Shareholders' Equity (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Common shares, Authorized 755 755  
Preferred shares, Authorized 0.5 0.5  
Treasury shares acquired (using Cost Method), Value $ 673 $ 450 $ 450
Class A common shares
      
Common shares, Authorized 750 750  
Common shares, Voting rights per share one vote one vote  
Class B common shares
      
Common shares, Authorized 5 5  
Common shares, Voting rights per share one-fifth of one vote one-fifth of one vote  
Treasury Shares
      
Treasury shares acquired (using Cost Method), Shares 9.9 10.2 10.3
Treasury shares acquired (using Cost Method), Value $ 673 $ 450 $ 450
Treasury Stock Acquired, Average Cost Per Share $ 67.85 $ 44.11 $ 43.64
Treasury Shares | Three Year Aggregate
      
Treasury shares acquired (using Cost Method), Shares 1,600.0