Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 28	$ 107
Deferred tax assets attributable to capital loss carryforwards	$ 10
Capital loss carryforwards period	5 years
Valuation allowance	$ 20	6
Liabilities for accrued interest related to uncertain tax benefits	22	26
Unrecognized tax benefits that would impact effective tax rate	$ 58	$ 74