Leases Schedule of Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2019	Dec. 31, 2019
Leases [Abstract]
Operating Lease, Cost	$ 30	$ 61
Amortization of right-of-use assets	4	8
Total finance lease cost	4	8
Variable lease cost	11	12
Total lease cost	$ 45	$ 81