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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 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation $ 23 $ 24 $ 40 $ 47
Restricted Share Unit        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation 16 17 34 34
Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation 5 5 10 10
Performance Share Unit        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation $ 2 $ 2 $ (4) $ 3