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Share-Based Compensation and Savings Plans (Summary of Restricted Shares and Restricted Share Unit Activity) (Details) (Restricted Shares And Share Units, USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Restricted Shares And Share Units
   
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Shares Nonvested, beginning balance 4 3
Shares, Granted 2 2
Shares, Vested (2) (1)
Shares, Canceled and forfeited 0 0
Shares Nonvested, ending balance 4 4
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Weighted Average Grant Date Fair Value Per Share, Nonvested beginning balance $ 31.31 $ 33.33
Weighted Average Grant Date Fair Value Per Share, Granted $ 41.67 $ 31.42
Weighted Average Grant Date Fair Value Per Share, Vested $ 32.50 $ 36.11
Weighted Average Grant Date Fair Value Per Share, Canceled and forfeited $ 0.00 $ 0.00
Weighted Average Grant Date Fair Value Per Share, Nonvested ending balance $ 35.46 $ 31.31