Segment Information (Reconciliation of Assets from Segments to Consolidated) (Details) - USD ($) $ in Millions		Sep. 30, 2019	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total assets		$ 20,534	$ 19,509
Investments	[1]	905	865
Operating Segments | Cable Network Programming Segment
Segment Reporting Information [Line Items]
Total assets		2,642	2,584
Operating Segments | Television Segment
Segment Reporting Information [Line Items]
Total assets		7,086	6,598
Other, Corporate and Eliminations Segment
Segment Reporting Information [Line Items]
Total assets		$ 9,901	$ 9,462

[1] Includes investments accounted for at fair value on a recurring basis of $804 million and $761 million as of September 30, 2019 and June 30, 2019, respectively (See Note 4—Fair Value).