Segment Information (Summary of Revenues by Segment by Component to Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Revenues	$ 2,667	$ 2,541
Operating Segments | Cable Network Programming Segment
Disaggregation Of Revenue [Line Items]
Revenues	1,285	1,265
Operating Segments | Cable Network Programming Segment | Affiliate Fee
Disaggregation Of Revenue [Line Items]
Revenues	939	939
Operating Segments | Cable Network Programming Segment | Advertising
Disaggregation Of Revenue [Line Items]
Revenues	254	264
Operating Segments | Cable Network Programming Segment | Other
Disaggregation Of Revenue [Line Items]
Revenues	92	62
Operating Segments | Television Segment
Disaggregation Of Revenue [Line Items]
Revenues	1,356	1,277
Operating Segments | Television Segment | Affiliate Fee
Disaggregation Of Revenue [Line Items]
Revenues	455	398
Operating Segments | Television Segment | Advertising
Disaggregation Of Revenue [Line Items]
Revenues	787	799
Operating Segments | Television Segment | Other
Disaggregation Of Revenue [Line Items]
Revenues	114	80
Other, Corporate and Eliminations Segment
Disaggregation Of Revenue [Line Items]
Revenues	$ 26	$ (1)