Segment Information (Reconciliation of Assets from Segments to Consolidated) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Jun. 30, 2017
Segment Reporting Information [Line Items]
Total assets	$ 52,858	$ 50,724
Investments	4,364	3,902
Operating Segments \| Cable Network Programming Segment
Segment Reporting Information [Line Items]
Total assets	25,282	24,913
Operating Segments \| Television Segment
Segment Reporting Information [Line Items]
Total assets	7,354	6,775
Operating Segments \| Filmed Entertainment Segment
Segment Reporting Information [Line Items]
Total assets	11,485	10,312
Other, Corporate and Eliminations Segment
Segment Reporting Information [Line Items]
Total assets	$ 4,373	$ 4,822

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

No definition available.

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