Description of the Business and Segment Information - Financial Information by Operating Segments (Detail) - USD ($) $ in Millions		3 Months Ended																12 Months Ended
		Sep. 30, 2017		Jul. 01, 2017		Apr. 01, 2017		Dec. 31, 2016		Oct. 01, 2016		Jul. 02, 2016		Apr. 02, 2016		Jan. 02, 2016		Sep. 30, 2017	Oct. 01, 2016		Oct. 03, 2015
Segment Reporting Information [Line Items]
Revenues		$ 12,779		$ 14,238		$ 13,336		$ 14,784		$ 13,142		$ 14,277		$ 12,969		$ 15,244		$ 55,137	$ 55,632		$ 52,465
Segment operating income		2,812	[1]	$ 4,011	[1]	$ 3,996	[1]	$ 3,956	[1]	3,176	[1]	$ 4,456	[1]	$ 3,822	[1]	$ 4,267	[1]	14,775	15,721		14,681
Corporate and unallocated shared expenses																		(582)	(640)		(643)
Restructuring and impairment charges																		(98)	(156)		(53)
Other income, net																		78	0		0
Interest expense, net																		(385)	(260)		(117)
Vice Gain																		0	332		0
Business Exit Costs																		0	129	[2]	0
Income before income taxes																		13,788	14,868		13,868
Capital expenditures																		3,623	4,773		4,265
Depreciation expense																		2,586	2,320		2,132
Amortization of intangible assets																		196	207		222
Identifiable assets	[3]	95,789								92,033								95,789	92,033
Goodwill, Not Allocated, Amount	[3],[4]	3,600								0								3,600	0
Affiliate Fees																		12,659	12,259		12,029
Advertising																		8,237	8,649		8,499
Retail merchandise, food and beverage																		6,433	6,116		5,986
Long-lived assets	[5]	77,774								72,951								77,774	72,951
United States and Canada
Segment Reporting Information [Line Items]
Revenues																		41,881	42,616		40,320
Segment operating income																		10,962	12,139		10,820
Long-lived assets	[5]	61,215								56,388								61,215	56,388
Europe
Segment Reporting Information [Line Items]
Revenues																		6,541	6,714		6,507
Segment operating income																		1,812	1,815		1,964
Long-lived assets	[5]	8,208								8,125								8,208	8,125
Asia Pacific
Segment Reporting Information [Line Items]
Revenues																		5,075	4,582		3,958
Segment operating income																		1,626	1,324		1,365
Long-lived assets	[5]	8,196								8,228								8,196	8,228
Latin America and Other
Segment Reporting Information [Line Items]
Revenues																		1,640	1,720		1,680
Segment operating income																		375	443		532
Long-lived assets	[5]	155								210								155	210
Media Networks
Segment Reporting Information [Line Items]
Revenues																		23,510	23,689		23,264
Segment operating income																		6,902	7,755		7,793
Depreciation expense																		225	237		245
Amortization of intangible assets																		12	18		21
Identifiable assets	[3]	32,475								32,706								32,475	32,706
Parks and Resorts
Segment Reporting Information [Line Items]
Revenues																		18,415	16,974		16,162
Segment operating income																		3,774	3,298		3,031
Amortization of intangible assets																		3	3		3
Identifiable assets	[3]	29,492								28,275								29,492	28,275
Theme park admissions																		6,502	5,900		5,483
Parks and Resorts | Domestic
Segment Reporting Information [Line Items]
Capital expenditures																		2,375	2,180		1,457
Depreciation expense																		1,336	1,273		1,169
Parks and Resorts | International
Segment Reporting Information [Line Items]
Capital expenditures																		816	2,035		2,147
Depreciation expense																		660	445		345
Studio Entertainment
Segment Reporting Information [Line Items]
Revenues																		8,379	9,441		7,366
Segment operating income																		2,355	2,703		1,973
Capital expenditures																		85	86		107
Depreciation expense																		50	51		55
Amortization of intangible assets																		65	74		84
Identifiable assets	[3]	16,307								15,359								16,307	15,359
Consumer Products and Interactive
Segment Reporting Information [Line Items]
Revenues																		4,833	5,528		5,673
Segment operating income																		1,744	1,965		1,884
Capital expenditures																		30	53		87
Depreciation expense																		63	63		69
Amortization of intangible assets																		116	112		114
Identifiable assets	[3]	8,996								9,332								8,996	9,332
Corporate
Segment Reporting Information [Line Items]
Capital expenditures																		178	253		269
Depreciation expense																		252	251		249
Identifiable assets	[3],[6]	$ 4,919								$ 6,361								4,919	6,361
Cable | Media Networks
Segment Reporting Information [Line Items]
Capital expenditures																		75	86		127
Broadcasting | Media Networks
Segment Reporting Information [Line Items]
Capital expenditures																		64	80		71
Intersegment | Studio Entertainment
Segment Reporting Information [Line Items]
Revenues																		492	740		528
Intersegment | Consumer Products and Interactive
Segment Reporting Information [Line Items]
Revenues																		(492)	(740)		(528)
Third Parties [Member] | Studio Entertainment
Segment Reporting Information [Line Items]
Revenues																		7,887	8,701		6,838
Third Parties [Member] | Consumer Products and Interactive
Segment Reporting Information [Line Items]
Revenues																		$ 5,325	$ 6,268		$ 6,201

[1] Segment operating results reflect earnings before the Infinity Charge, corporate and unallocated shared expenses, restructuring and impairment charges, other expense, interest income/(expense), income taxes and noncontrolling interests. Segment operating income includes equity in the income of investees except for the Vice Gain.

[2] In fiscal 2016, the Company discontinued its Infinity console game business, which is reported in the Consumer Products & Interactive Media segment, and recorded a charge (Infinity Charge) primarily to write down inventory. The charge also included severance and other asset impairments. The charge was reported in “Cost of products” in the Consolidated Statement of Income.

[3] 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

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

[5] Long-lived assets are total assets less the following: current assets, long-term receivables, deferred taxes, financial investments and derivatives.

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