Description of the Business and Segment Information - Financial Information by Operating Segments (Detail) - USD ($) $ in Millions		3 Months Ended																12 Months Ended
		Sep. 29, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 30, 2017		Sep. 30, 2017		Jul. 01, 2017		Apr. 01, 2017		Dec. 31, 2016		Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Segment Reporting Information [Line Items]
Revenues		$ 14,307		$ 15,228		$ 14,548		$ 15,351		$ 12,779		$ 14,238		$ 13,336		$ 14,784		$ 59,434	$ 55,137	$ 55,632
Segment operating income		3,290	[1]	$ 4,193	[1]	$ 4,237	[1]	$ 3,986	[1]	2,812	[1]	$ 4,011	[1]	$ 3,996	[1]	$ 3,956	[1]	15,706	14,775	15,721
Corporate and unallocated shared expenses																		(761)	(582)	(640)
Restructuring and impairment charges																		(33)	(98)	(156)
Other income, net																		601	78	0
Interest expense, net																		(574)	(385)	(260)
Vice Gain																		0	0	332
Business Exit Costs																		0	0	(129)
Equity Method Investment, Other than Temporary Impairment																		(210)	0	0
Income before income taxes																		14,729	13,788	14,868
Capital expenditures																		4,465	3,623	4,773
Depreciation expense																		2,758	2,586	2,320
Amortization of intangible assets																		253	196	207
Identifiable assets	[2]	98,598								95,789								98,598	95,789
Goodwill, Not Allocated, Amount	[2],[3]	0								3,600								0	3,600
Affiliate Fees																		13,279	12,659	12,259
Advertising																		7,904	8,237	8,649
Retail merchandise, food and beverage																		6,923	6,433	6,116
Long-lived assets		79,426								77,774								79,426	77,774
United States and Canada
Segment Reporting Information [Line Items]
Revenues																		45,038	41,881	42,616
Segment operating income																		11,413	10,962	12,139
Long-lived assets		65,245								61,215								65,245	61,215
Europe
Segment Reporting Information [Line Items]
Revenues																		7,026	6,541	6,714
Segment operating income																		1,922	1,812	1,815
Long-lived assets		6,275								8,208								6,275	8,208
Asia Pacific
Segment Reporting Information [Line Items]
Revenues																		5,531	5,075	4,582
Segment operating income																		1,869	1,626	1,324
Long-lived assets		7,775								8,196								7,775	8,196
Latin America and Other
Segment Reporting Information [Line Items]
Revenues																		1,839	1,640	1,720
Segment operating income																		502	375	443
Long-lived assets		131								155								131	155
Media Networks
Segment Reporting Information [Line Items]
Revenues																		24,500	23,510	23,689
Segment operating income																		6,625	6,902	7,755
Depreciation expense																		264	225	237
Amortization of intangible assets																		62	12	18
Identifiable assets	[2]	35,899								32,475								35,899	32,475
Media Networks | Cable
Segment Reporting Information [Line Items]
Capital expenditures																		202	75	86
Media Networks | Broadcasting
Segment Reporting Information [Line Items]
Capital expenditures																		87	64	80
Parks and Resorts
Segment Reporting Information [Line Items]
Revenues																		20,296	18,415	16,974
Segment operating income																		4,469	3,774	3,298
Amortization of intangible assets																		4	3	3
Identifiable assets	[2]	30,670								29,492								30,670	29,492
Theme park admissions																		7,183	6,502	5,900
Parks and Resorts | Domestic
Segment Reporting Information [Line Items]
Capital expenditures																		3,212	2,375	2,180
Depreciation expense																		1,410	1,336	1,273
Parks and Resorts | International
Segment Reporting Information [Line Items]
Capital expenditures																		671	816	2,035
Depreciation expense																		742	660	445
Studio Entertainment
Segment Reporting Information [Line Items]
Revenues																		9,987	8,379	9,441
Segment operating income																		2,980	2,355	2,703
Capital expenditures																		96	85	86
Depreciation expense																		55	50	51
Amortization of intangible assets																		64	65	74
Identifiable assets	[2]	17,154								16,307								17,154	16,307
Studio Entertainment | Intersegment
Segment Reporting Information [Line Items]
Revenues																		556	492	740
Studio Entertainment | Third Parties [Member]
Segment Reporting Information [Line Items]
Revenues																		9,431	7,887	8,701
Consumer Products and Interactive
Segment Reporting Information [Line Items]
Revenues																		4,651	4,833	5,528
Segment operating income																		1,632	1,744	1,965
Capital expenditures																		18	30	53
Depreciation expense																		69	63	63
Amortization of intangible assets																		123	116	112
Identifiable assets	[2]	8,793								8,996								8,793	8,996
Consumer Products and Interactive | Intersegment
Segment Reporting Information [Line Items]
Revenues																		(556)	(492)	(740)
Consumer Products and Interactive | Third Parties [Member]
Segment Reporting Information [Line Items]
Revenues																		5,207	5,325	6,268
Corporate
Segment Reporting Information [Line Items]
Capital expenditures																		179	178	253
Depreciation expense																		218	252	$ 251
Identifiable assets	[2],[4]	$ 6,082								$ 4,919								$ 6,082	$ 4,919

[1] Segment operating results reflect earnings before the corporate and unallocated shared expenses, restructuring and impairment charges, other income, net, interest expense, net, income taxes and noncontrolling interests.

[2] 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

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

[4] Primarily fixed assets and cash and cash equivalents.