Acquisitions, Disposals and Other Transactions (Fiscal 2018) (Narrative) (Details) $ in Millions		1 Months Ended		12 Months Ended
		Jul. 31, 2017 USD ($)	Mar. 31, 2017 TelevisionStation	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Disposals
Proceeds from the relinquishment of spectrum				$ 0	$ 0	$ 354
Television Broadcast Station Spectrum
Disposals
Proceeds from the relinquishment of spectrum		$ 354
Number of television stations with bids to relinquish spectrum accepted by the FCC as part of the auction | TelevisionStation			3
Pre-tax gain on disposals	[1]			$ 0	$ 12	$ 102

[1] See Note 3—Acquisitions, Disposals and Other Transactions under the heading “Fiscal 2018.”