Goodwill and Intangible Assets, Net (Changes in Carrying Values of Intangible Assets and Related Accumulated Amortization) (Details) - USD ($) $ in Millions		6 Months Ended
		Dec. 31, 2019	Jun. 30, 2019
Intangible Assets [Line Items]
Intangible assets not subject to amortization		$ 2,809	$ 2,809
Amortizable intangible assets, net, beginning	[1]	42
Amortizable intangible assets, net, amortization	[1]	(13)
Amortizable intangible assets, net, acquisitions	[1],[2]	73
Amortizable intangible assets, net, ending	[1]	102
Total intangible assets, net		2,911	2,851
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 $142 million and $129 million as of December 31, 2019 and June 30, 2019, respectively. The average useful life of amortizable intangible assets ranges from five to 20 years.

[2] See Note 2—Acquisitions, Disposals and Other Transactions under the heading “Credible Acquisition.”