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, 2019		Jun. 30, 2018	Jun. 30, 2017
Intangible Assets [Line Items]
Intangible assets not subject to amortization		$ 2,809		$ 2,809
Amortizable intangible assets, net, beginning	[1]	57
Amortizable intangible assets, net, amortization		(15)	[1]	(14)	$ (15)
Amortizable intangible assets, net, ending	[1]	42		57
Total intangible assets, net		2,851		2,866
FCC licenses
Intangible Assets [Line Items]
Intangible assets not subject to amortization		2,167		2,167
Other
Intangible Assets [Line Items]
Intangible assets not subject to amortization		$ 642		$ 642

[1] Net of accumulated amortization of $129 million and $114 million as of June 30, 2019 and 2018, respectively. The average useful life of other intangible assets ranges from five to 20 years.