Restructuring and Employee Severance (Activity Related to Restructuring and Employee Severance Costs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Employee-related costs	$ (1)	$ 14	$ 18	$ 27
Facility Exit and Other Costs	3	1	137	4
Total restructuring and employee severance	$ 2	$ 15	$ 155	$ 31