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, 2021		Jun. 30, 2020		Jun. 30, 2019
Intangible Assets [Line Items]
Intangible assets not subject to amortization, beginning		$ 2,892		$ 2,809
Intangible assets not subject to amortization, acquisitions	[1]	0		113
Intangible assets not subject to amortization, disposals	[1]			(30)
Intangible assets not subject to amortization, ending		2,892		2,892		$ 2,809
Amortizable intangible assets, net, beginning	[2]	306		42
Amortizable intangible assets, net, acquisitions	[1],[2]	19		300
Amortizable intangible assets, net, disposals	[1],[2]			0
Amortizable intangible assets, net, amortization		(63)	[2]	(36)	[2]	(15)
Amortizable intangible assets, net, ending	[2]	262		306		42
Total intangible assets, net, beginning		3,198		2,851
Total intangible assets, net, acquisitions	[1]	19		413
Total intangible assets, net, disposals	[1]			(30)
Total intangible assets, net, ending		3,154		3,198		2,851
FCC licenses
Intangible Assets [Line Items]
Intangible assets not subject to amortization, beginning		2,250		2,167
Intangible assets not subject to amortization, acquisitions	[1]	0		113
Intangible assets not subject to amortization, disposals	[1]			(30)
Intangible assets not subject to amortization, ending		2,250		2,250		2,167
Other
Intangible Assets [Line Items]
Intangible assets not subject to amortization, beginning		642		642
Intangible assets not subject to amortization, acquisitions	[1]	0		0
Intangible assets not subject to amortization, disposals	[1]			0
Intangible assets not subject to amortization, ending		$ 642		$ 642		$ 642

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

[2] Net of accumulated amortization of $228 million and $165 million as of June 30, 2021 and 2020, respectively.