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Share-Based Compensation (Schedule of Total Share-Based Compensation Expense by Type of Award) (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total share-based compensation expense $ 85 $ 96 $ 111
Restricted Share Unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total share-based compensation expense 73 69 69
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total share-based compensation expense 22 19 21
Performance Share Unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total share-based compensation expense $ (10) $ 8 $ 21