Income Taxes (Schedule of Components of Provision for Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Income Tax Provision, Continuing Operations [Abstract]
Federal	$ 127	$ 481	$ 638
State, local and other	68	64	102
Total current	195	545	740
Deferred	386	(603)	92
Provision for income taxes	$ 581	$ (58)	$ 832