Description of Business and Basis of Presentation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Mar. 20, 2019	Mar. 19, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Disclosure Basis Of Presentation Details [Line Items]
Estimated annual tax deductions resulting from the Separation and the Distribution, amount		$ 1,500
Estimated annual tax deductions resulting from the Separation and the Distribution, period			15 years
Estimated reduction to the annual cash tax liability resulting from the Separation and the Distribution, amount		$ 370
Federal and state applicable tax rate		25.00%	26.00%	(3.00%)	37.00%
Separation And Distribution Agreement
Disclosure Basis Of Presentation Details [Line Items]
Prepayment of the Company's share of the estimated taxes resulting from the anticipated divestitures by Disney of certain assets		$ 700
Dividend paid immediately prior to the Distribution		8,500
Amount of taxes in respect of the Separation and the Distribution and a prepayment of the estimated taxes in respect of divestitures (collectively, the Transaction Tax)		6,500
Amount of cash payment received, which had the net effect of reducing the Dividend	$ 2,000
Estimated tax liability included in Transaction Tax paid		$ 5,800
Class A Common Stock
Disclosure Basis Of Presentation Details [Line Items]
Common stock, shares outstanding		354,328,270	354,422,419
Common stock, par value		$ 0.01	$ 0.01
Class B Common Stock
Disclosure Basis Of Presentation Details [Line Items]
Common stock, shares outstanding		266,173,651	266,173,651
Common stock, par value		$ 0.01	$ 0.01