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Share-Based Compensation (Schedule of Additional Data Related to Stock Options) (Details) - Stock Options - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 31  
Aggregate intrinsic value of outstanding options at period end 47 $ 109
Aggregate intrinsic value of exercisable options at period end $ 47 $ 106
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 7 years 7 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 6 years 6 years