Leases (Summary of Lease Costs and Supplemental Cash Flows Information) (Details) $ in Millions	3 Months Ended
	Sep. 30, 2019 USD ($)
Lease costs
Total lease costs	$ 30	[1]
Supplemental cash flows information
Operating cash flows from operating leases	$ 38

[1] Total lease costs of $30 million are net of sublease income of approximately $10 million.