Restructuring and Employee Severance (Activity Related to Restructuring and Employee Severance Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Employee-related costs	$ 15	$ 6	$ 19	$ 13
Facility Exit and Other Costs	6	1	134	3
Total restructuring and employee severance	$ 21	$ 7	$ 153	$ 16