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Share-Based Compensation and Savings Plans (Schedule of Additional Data Related to Stock Options) (Details) - Stock Options - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2015
Jun. 30, 2015
Aggregate intrinsic value of outstanding options at period end $ 277 $ 281
Aggregate intrinsic value of exercisable options at period end $ 233 $ 193
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 7 years 6 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5 years 5 years