Restructuring and Employee Severance (Activity Related to Restructuring and Employee Severance Costs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Employee-related costs	$ 29	$ (1)	$ 70	$ 18
Facility Exit and Other Costs	24	3	27	137
Total restructuring and employee severance	$ 53	$ 2	$ 97	$ 155