Segment Information (Reconciliation of Assets from Segments to Consolidated) (Details) - USD ($) $ in Millions		Mar. 31, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total assets		$ 20,237	$ 19,509
Investments	[1]	347	865
Operating Segments | Cable Network Programming Segment
Segment Reporting Information [Line Items]
Total assets		2,714	2,584
Operating Segments | Television Segment
Segment Reporting Information [Line Items]
Total assets		7,226	6,598
Operating Segments | Other, Corporate and Eliminations Segment
Segment Reporting Information [Line Items]
Total assets		$ 9,950	$ 9,462

[1] Includes investments accounted for at fair value on a recurring basis of $256 million and $761 million as of March 31, 2020 and June 30, 2019, respectively (See Note 4—Fair Value).