Leases (Summary of Lease Costs and Supplemental Cash Flows Information) (Parenthetical) (Details) $ in Millions	3 Months Ended
	Sep. 30, 2019 USD ($)
Lease Costs [Abstract]
Lease costs	$ 30	[1]
Sublease income	$ 10

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