Segment Information (Reconciliation of Revenues and Segment EBITDA from Segments to Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 2,513	$ 2,752	$ 3,583	$ 2,541	$ 2,394	$ 2,463	$ 3,108	$ 2,188	$ 11,389	$ 10,153	$ 9,921
Total Segment EBITDA									2,681	2,492	2,786
Operating Segments | Cable Network Programming Segment
Segment Reporting Information [Line Items]
Revenues									5,381	5,049	4,323
Total Segment EBITDA									2,495	2,308	2,055
Operating Segments | Television Segment
Segment Reporting Information [Line Items]
Revenues									5,979	5,106	5,600
Total Segment EBITDA									470	379	909
Other, Corporate and Eliminations Segment
Segment Reporting Information [Line Items]
Revenues									29	(2)	(2)
Total Segment EBITDA									$ (284)	$ (195)	$ (178)