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Share-Based Compensation (Schedule of Total Share-Based Compensation Expense by Type of Award) (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation $ 20 $ 19
Restricted Share Unit    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation 17 14
Employee Stock Option    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation 1 4
Performance Share Unit    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation $ 2 $ 1