Share-Based Compensation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Share-Based Compensation
Allocated Share-based Compensation Expense	$ 70	$ 69	$ 151	$ 153
Pension Plan [Member]
Share-Based Compensation
Defined Benefit Plan, Net Periodic Benefit Cost	111	107	228	211
Other Postretirement Benefit Plan [Member]
Share-Based Compensation
Defined Benefit Plan, Net Periodic Benefit Cost	$ 6	$ 14	$ 10	$ 27