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Share-Based Compensation and Savings Plans (Schedule of All Stock Option Transactions Under the Plans) (Details)
shares in Millions
 6 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Stock Options Outstanding at Beginning of Period | shares 8
Stock Options Outstanding, Granted | shares 1
Stock Options Outstanding, Exercised | shares (1)
Stock Options Outstanding, Canceled and forfeited | shares 0
Stock Options Outstanding at End of Period | shares 8
Stock Options Outstanding, Exercisable at End of Period | shares 5
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted-Average Exercise Price [Roll Forward]  
Weighted-Average Exercise Price Per Common Share, Outstanding at Beginning of Period | $ / shares $ 46.50
Weighted-Average Exercise Price Per Common Share, Granted | $ / shares 84.19
Weighted-Average Exercise Price Per Common Share, Exercised | $ / shares 40.31
Weighted-Average Exercise Price Per Common Share, Canceled and forfeited | $ / shares 0.00
Weighted-Average Exercise Price Per Common Share, Outstanding at End of Period | $ / shares 53.45
Weighted-Average Exercise Price Per Common Share, Exercisable at End of Period | $ / shares $ 42.05