Description of the Business and Segment Information - Financial Information by Operating Segments (Parenthetical) (Detail) - USD ($) $ in Millions		Sep. 30, 2017	Oct. 01, 2016
Segment Reporting Information [Line Items]
Equity method investments	[1]	$ 3,087	$ 4,082
Goodwill and intangible assets		38,421	34,759
Goodwill, Not Allocated, Amount	[2],[3]	3,600	0
Media Networks
Segment Reporting Information [Line Items]
Equity method investments		2,998	4,032
Goodwill and intangible assets		18,346	18,153
Parks and Resorts
Segment Reporting Information [Line Items]
Equity method investments		70	22
Goodwill and intangible assets		391	373
Studio Entertainment
Segment Reporting Information [Line Items]
Equity method investments		1	3
Goodwill and intangible assets		8,360	8,450
Consumer Products and Interactive
Segment Reporting Information [Line Items]
Equity method investments		0	0
Goodwill and intangible assets		7,594	7,653
Corporate
Segment Reporting Information [Line Items]
Equity method investments		18	25
Goodwill and intangible assets		$ 130	$ 130

[1] Prior to September 25, 2017, BAMTech was accounted for under the equity basis of accounting. At September 25, 2017, the Company acquired an additional interest and now consolidates BAMTech (see Note 3 for further discussion of the BAMTech transaction). Accordingly, equity basis investments decreased by approximately $1 billion.

[2] Identifiable assets include amounts associated with equity method investments, goodwill and intangible assets. Equity method investments by segment are as follows: 2017 2016Media Networks$2,998 $4,032Parks and Resorts70 22Studio Entertainment1 3Consumer Products & Interactive Media— —Corporate18 25 $3,087 $4,082Goodwill and intangible assets by segment are as follows: 2017 2016Media Networks$18,346 $18,153Parks and Resorts391 373Studio Entertainment8,360 8,450Consumer Products & Interactive Media7,594 7,653Corporate130 130Unallocated Goodwill3,600 — $38,421 $34,759

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