Additional Financial Information (Components of Other, Net) (Details) - USD ($) $ in Millions		3 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Transaction costs	[1]	$ (45)	$ (40)
Unrealized gains on investments	[2]	43	183
Other		(13)	(4)
Total other, net		$ (15)	$ 139

[1] The transaction costs for the three months ended September 30, 2019 and 2018 are primarily related to the Separation and the Distribution and include retention related costs and for the three months ended September 30, 2019 also includes costs associated with the profits participants litigation (See Note 9—Commitments and Contingencies under the heading “Profits Participants Litigation”).

[2] Represents the net unrealized gains related to changes in fair value of the Company’s investments in Roku and The Stars Group which are recognized in the Statements of Operations in accordance with ASC 321 (See Note 4—Fair Value).