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Share-Based Compensation (Additional Data Related to Performance Share Unit Activity) (Details) - Performance Share Units - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total compensation cost, net of estimated forfeitures, related to nonvested performance share units not yet recognized, pre-tax $ 17 $ 16 $ 15
Weighted-average period over which performance 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 $ 16 $ 8 $ 7