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Share-Based Compensation (Summary of Performance Share Unit Activity) (Details) (Performance Shares, USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended
Aug. 31, 2012
Sep. 30, 2012
Performance Shares
   
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   1
Shares, Granted 0.35 0 [1]
Shares, Vested   0
Shares, Canceled and forfeited   0
Shares Nonvested at September 30, 2012   1
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   $ 42.60
Weighted-Average Grant Date Fair Value Per Share, Granted $ 39.81 $ 0.00 [1]
Weighted-Average Grant Date Fair Value Per Share, Vested   $ 0.00
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   $ 41.36
[1] During the three months ended September 30, 2012, 350 thousand performance share units were granted at target at a weighted-average fair value of $39.81