Income Taxes (Schedule of Components of Provision for Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Income Tax Provision, Continuing Operations [Abstract]
Federal	$ 110	$ 127	$ 481
State, local and other	9	68	64
Total current	119	195	545
Deferred	283	386	(603)
Provision for income taxes	$ 402	$ 581	$ (58)