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Share-Based Compensation (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
3 Months Ended
Sep. 30, 2012
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 at June 30, 2012 4
Shares, Granted 2.00
Shares, Vested (2)
Shares, Canceled and forfeited 0
Shares Nonvested at September 30, 2012 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 at June 30, 2012 $ 35.46
Weighted-Average Grant Date Fair Value Per Share, Granted $ 39.79
Weighted-Average Grant Date Fair Value Per Share, Vested $ 32.94
Weighted-Average Grant Date Fair Value Per Share, Canceled and forfeited $ 0.00
Weighted-Average Grant Date Fair Value Per Share, Nonvested at September 30, 2012 $ 38.58