Description of the Business and Segment Information - Financial Information by Operating Segments (Parenthetical) (Detail) - USD ($) $ in Millions		Sep. 29, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Equity method investments		$ 2,768	$ 3,087
Goodwill and intangible assets		38,081	38,421
Goodwill, Not Allocated, Amount	[1],[2]	0	3,600
Media Networks
Segment Reporting Information [Line Items]
Equity method investments		2,750	2,998
Goodwill and intangible assets		21,417	18,346
Parks and Resorts
Segment Reporting Information [Line Items]
Equity method investments		1	70
Goodwill and intangible assets		388	391
Studio Entertainment
Segment Reporting Information [Line Items]
Equity method investments		1	1
Goodwill and intangible assets		8,644	8,360
Consumer Products and Interactive
Segment Reporting Information [Line Items]
Equity method investments		0	0
Goodwill and intangible assets		7,502	7,594
Corporate
Segment Reporting Information [Line Items]
Equity method investments		16	18
Goodwill and intangible assets		$ 130	$ 130

[1] Identifiable assets include amounts associated with equity method investments, goodwill and intangible assets. Equity method investments by segment are as follows: 2018 2017Media Networks$2,750 $2,998Parks and Resorts1 70Studio Entertainment1 1Consumer Products & Interactive Media— —Corporate16 18 $2,768 $3,087Goodwill and intangible assets by segment are as follows: 2018 2017Media Networks$21,417 $18,346Parks and Resorts388 391Studio Entertainment8,644 8,360Consumer Products & Interactive Media7,502 7,594Corporate130 130Unallocated Goodwill— 3,600 $38,081 $38,421

[2] Unallocated Goodwill relates to the BAMTech acquisition (see Note 3 for further discussion of the transaction).