Acquisitions Changes in Carry Amount of Goodwill (Details) $ in Millions	9 Months Ended
Jun. 30, 2018 USD ($)
Goodwill [Line Items]
Beginning balance	$ 31,426
Acquisitions	0
Dispositions	0
Other, net	(120)
Ending balance	31,306
Media Networks [Member]
Goodwill [Line Items]
Beginning balance	16,325
Acquisitions	0
Dispositions	0
Other, net	3,078
Ending balance	19,403
Parks And Resorts [Member]
Goodwill [Line Items]
Beginning balance	291
Acquisitions	0
Dispositions	0
Other, net	0
Ending balance	291
Studio Entertainment [Member]
Goodwill [Line Items]
Beginning balance	6,817
Acquisitions	0
Dispositions	0
Other, net	363
Ending balance	7,180
Consumer Products and Interactive [Member]
Goodwill [Line Items]
Beginning balance	4,393
Acquisitions	0
Dispositions	0
Other, net	39
Ending balance	4,432
Unallocated [Member]
Goodwill [Line Items]
Beginning balance	3,600
Acquisitions	0
Dispositions	0
Other, net	(3,600)
Ending balance	$ 0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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