Goodwill and Intangible Assets, Net (Changes in Carrying Values of Intangible Assets and Related Accumulated Amortization) (Details) - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2020		Jun. 30, 2019	Jun. 30, 2018
Intangible Assets [Line Items]
Intangible assets not subject to amortization, beginning		$ 2,809
Intangible assets not subject to amortization, acquisitions	[1]	113
Intangible assets not subject to amortization, disposals	[1]	(30)
Intangible assets not subject to amortization, ending		2,892		$ 2,809
Amortizable intangible assets, net, beginning	[2]	42
Amortizable intangible assets, net, acquisitions	[1],[2]	300
Amortizable intangible assets, net, disposals	[1],[2]	0
Amortizable intangible assets, net, amortization		(36)	[2]	(15)	$ (14)
Amortizable intangible assets, net, ending	[2]	306		42
Total intangible assets, net, beginning		2,851
Total intangible assets, net, acquisitions	[1]	413
Total intangible assets, net, disposals	[1]	(30)
Total intangible assets, net, ending		3,198		2,851
FCC licenses
Intangible Assets [Line Items]
Intangible assets not subject to amortization, beginning		2,167
Intangible assets not subject to amortization, acquisitions	[1]	113
Intangible assets not subject to amortization, disposals	[1]	(30)
Intangible assets not subject to amortization, ending		2,250		2,167
Other
Intangible Assets [Line Items]
Intangible assets not subject to amortization, beginning		642
Intangible assets not subject to amortization, acquisitions	[1]	0
Intangible assets not subject to amortization, disposals	[1]	0
Intangible assets not subject to amortization, ending		$ 642		$ 642

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

[2] Net of accumulated amortization of $165 million and $129 million as of June 30, 2020 and 2019, respectively. The average useful life of amortizable intangible assets ranges from three to 20 years.