Acquisitions Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions		12 Months Ended
		Sep. 28, 2019		Sep. 29, 2018
Goodwill [Roll Forward]
Beginning balance		$ 31,269		$ 31,426
Acquisitions		49,085	[1]	0
Dispositions		0		0
Other, net		(61)		(157)	[2]
Segment Recast	[3]			0
Ending balance		80,293		31,269
Media Networks
Goodwill [Roll Forward]
Beginning balance		15,989		16,325
Acquisitions		17,434	[1]	0
Dispositions		0		0
Other, net		0		3,063	[2]
Segment Recast	[3]			(3,399)
Ending balance		33,423		15,989
Parks and Resorts
Goodwill [Roll Forward]
Beginning balance		0		291
Acquisitions		0	[1]	0
Dispositions		0		0
Other, net		0		0	[2]
Segment Recast	[3]			(291)
Ending balance		0		0
Studio Entertainment
Goodwill [Roll Forward]
Beginning balance		7,094		6,817
Acquisitions		10,711	[1]	0
Dispositions		0		0
Other, net		(8)		347	[2]
Segment Recast	[3]			(70)
Ending balance		17,797		7,094
Consumer Products and Interactive
Goodwill [Roll Forward]
Beginning balance		0		4,393
Acquisitions		0	[1]	0
Dispositions		0		0
Other, net		0		33	[2]
Segment Recast	[3]			(4,426)
Ending balance		0		0
Parks, Experiences and Products
Goodwill [Roll Forward]
Beginning balance		4,487		0
Acquisitions		1,048	[1]	0
Dispositions		0		0
Other, net		0		0	[2]
Segment Recast	[3]			4,487
Ending balance		5,535		4,487
Direct-to-Consumer & International
Goodwill [Roll Forward]
Beginning balance		3,699		0
Acquisitions		19,892	[1]	0
Dispositions		0		0
Other, net		53		0	[2]
Segment Recast	[3]			3,699
Ending balance		23,538		3,699
Unallocated
Goodwill [Roll Forward]
Beginning balance		0		3,600
Acquisitions		0	[1]	0
Dispositions		0		0
Other, net		0		(3,600)	[2]
Segment Recast	[3]			0
Ending balance		$ 0		$ 0

[1] Represents the acquisition of TFCF and consolidation of Hulu.

[2] Primarily represents the allocation of BAMTech goodwill to the segments based on the final purchase price allocation and also includes the impact of updates to our initial estimated fair value of intangible assets related to BAMTech.

[3] Represents the reallocation of goodwill as a result of the Company recasting its segments as a result of a strategic reorganization during fiscal 2018.