Description of Business and Basis of Presentation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended	12 Months Ended
	Mar. 20, 2019	Mar. 19, 2019	Sep. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Disclosure Basis Of Presentation Details [Line Items]
Settlement of Divestiture Tax prepayment				$ 462	$ 0	$ 0
Estimated annual tax deductions resulting from the Separation and the Distribution, amount		$ 1,500
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%		25.00%	27.00%	26.00%
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
Settlement of Divestiture Tax prepayment			$ 462
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		354,000,000		324,361,864	343,608,673
Common stock, par value		$ 0.01		$ 0.01	$ 0.01
Class B Common Stock
Disclosure Basis Of Presentation Details [Line Items]
Common stock, shares outstanding		266,000,000		251,821,556	261,078,355
Common stock, par value		$ 0.01		$ 0.01	$ 0.01