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Share-Based Compensation (Schedule of Additional Data Related to Stock Option Activity) (Details) (Stock Options, USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Stock Options
   
Aggregate intrinsic value of outstanding options at period end, Stock Options $ 282 $ 282
Aggregate intrinsic value of exercisable options at period end, Stock Options $ 219 $ 185
Weighted-average remaining contractual life of outstanding options 6 years 6 years
Weighted-average remaining contractual life of exercisable options 5 years 4 years