Share-Based Compensation (Schedule of Total Share-Based Compensation Expense by Type of Award) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Share-based compensation expense	$ 27	$ 24	$ 80	$ 72
Restricted Share Units
Share-based compensation expense	18	15	52	46
Stock Options
Share-based compensation expense	6	6	16	16
Performance Share Units
Share-based compensation expense	$ 3	$ 3	$ 12	$ 10