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Share-Based Compensation (Additional Data Related to Restricted Share Unit Activity) (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Restricted Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total compensation cost, net of estimated forfeitures, related to nonvested restricted share and share unit awards not yet recognized, pre-tax $ 77 $ 75 $ 78
Weighted-average period in years over which restricted share and share unit cost is expected to be recognized (in years) 2 years 2 years 2 years
Total fair value of shares vested during the year $ 57 $ 68 $ 65
Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total compensation cost, net of estimated forfeitures, related to nonvested restricted share and share unit awards not yet recognized, pre-tax $ 29 $ 12 $ 1
Weighted-average period in years over which restricted share and share unit cost is expected to be recognized (in years) 2 years 2 years 2 years
Total fair value of shares vested during the year $ 5 $ 0 $ 14