Segment Information (Reconciliation of Assets from Segments to Consolidated) (Details) - USD ($) $ in Millions		Dec. 31, 2018	Jun. 30, 2018
Segment Reporting Information [Line Items]
Total assets		$ 13,466	$ 13,121
Investments	[1]	289	275
Operating Segments | Cable Network Programming Segment
Segment Reporting Information [Line Items]
Total assets		2,545	2,430
Operating Segments | Television Segment
Segment Reporting Information [Line Items]
Total assets		7,591	6,805
Other, Corporate and Eliminations Segment
Segment Reporting Information [Line Items]
Total assets		$ 3,041	$ 3,611

[1] Includes an investment with a readily determinable fair value of $185 million and $257 million as of December 31, 2018 and June 30, 2018, respectively (See Note 4 - Fair Value). See Note 2 - Acquisitions, Disposals and Other Transactions for information on recent investments.