Segment Information (Reconciliation of Revenues and Segment OIBDA from Segments to Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 3,583	$ 3,108	$ 6,124	$ 5,296
Total Segment OIBDA	445	473	1,206	1,146
Operating Segments | Cable Network Programming Segment
Segment Reporting Information [Line Items]
Revenues	1,434	1,315	2,699	2,453
Total Segment OIBDA	519	462	1,152	1,038
Operating Segments | Television Segment
Segment Reporting Information [Line Items]
Revenues	2,149	1,793	3,426	2,844
Total Segment OIBDA	(14)	62	157	187
Other, Corporate and Eliminations Segment
Segment Reporting Information [Line Items]
Revenues	0	0	(1)	(1)
Total Segment OIBDA	$ (60)	$ (51)	$ (103)	$ (79)