Share-Based Compensation (Schedule of All Stock Option Transactions Under the Plans) (Details) shares in Millions	3 Months Ended
	Sep. 30, 2017 $ / shares shares
Stock Options
Outstanding at beginning of period (in shares) | shares	6
Granted (in shares) | shares	2
Exercised (in shares) | shares	0
Canceled and forfeited (in shares) | shares	0
Outstanding at end of period (in shares) | shares	8
Exercisable at end of period (in shares) | shares	5
Weighted-Average Exercise Price per Common Share
Outstanding at beginning of period (in usd per share) | $ / shares	$ 63.44
Granted (in usd per share) | $ / shares	66.44
Exercised (in usd per share) | $ / shares	0.00
Canceled and forfeited (in usd per share) | $ / shares	0.00
Outstanding at end of period (in usd per share) | $ / shares	64.30
Exercisable at end of period (in usd per share) | $ / shares	$ 59.19