Acquisitions Changes in Carry Amount of Goodwill (Details) $ in Millions	3 Months Ended
	Dec. 30, 2017 USD ($)
Goodwill [Line Items]
Beginning balance	$ 31,426
Acquisitions	0
Dispositions	0
Other, net	4
Ending balance	31,430
Media Networks [Member]
Goodwill [Line Items]
Beginning balance	16,325
Acquisitions	0
Dispositions	0
Other, net	7
Ending balance	16,332
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	7
Ending balance	6,824
Consumer Products and Interactive [Member]
Goodwill [Line Items]
Beginning balance	4,393
Acquisitions	0
Dispositions	0
Other, net	2
Ending balance	4,395
Unallocated [Member]
Goodwill [Line Items]
Beginning balance	3,600	[1]
Acquisitions	0	[1]
Dispositions	0	[1]
Other, net	(12)	[1]
Ending balance	$ 3,588	[1]

[1] Goodwill will be allocated to the segments once the BAMTech purchase price allocation is finalized.