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Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Stock Options
Sep. 30, 2013
Stock Options
Minimum
Sep. 30, 2013
Stock Options
Maximum
Sep. 30, 2013
Restricted Share Units
Jun. 30, 2013
Restricted Share Units
Sep. 30, 2013
Performance Share Units
Sep. 30, 2013
Performance Share Units
Minimum
Sep. 30, 2013
Performance Share Units
Maximum
Share-based Compensation Arrangement by Share-based Payment Award                    
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 9 $ 8                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, in years     3 years     3 years     2 years 3 years
Exercisable period of plans, in years       7 years 10 years          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 38     $ 113   $ 24    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years     2 years   2 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage               143.00% 0.00% 200.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           1,000   274    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value           $ 51.51   $ 51.49    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period           1,000   157    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value           $ 37.45   $ 41.60    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested           3,000 3,000 870    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value           $ 44.77 $ 38.74 $ 44.40