Description of the Business and Segment Information - Financial Information by Operating Segments (Detail) - USD ($) $ in Millions		3 Months Ended																12 Months Ended
		Oct. 03, 2020		Jun. 27, 2020		Mar. 28, 2020		Dec. 28, 2019		Sep. 28, 2019		Jun. 29, 2019		Mar. 30, 2019		Dec. 29, 2018		Oct. 03, 2020		Sep. 28, 2019		Sep. 29, 2018
Segment Reporting Information [Line Items]
Revenues		$ 14,707	[1]	$ 11,779	[1]	$ 18,025	[1]	$ 20,877	[1]	$ 19,118	[1]	$ 20,262	[1]	$ 14,924		$ 15,303		$ 65,388		$ 69,607		$ 59,434
Segment operating income		606	[1],[2]	1,099	[1],[2]	2,407	[1],[2]	3,996	[1],[2]	3,425	[1],[2]	3,952	[1],[2]	3,815	[2]	3,655	[2]	8,108	[3]	14,847	[3]	15,689	[3]
Corporate and unallocated shared expenses																		(817)		(987)		(744)
Restructuring and impairment charges																		(5,735)		(1,183)		(33)
Other income, net																		1,038		4,357		601
Interest expense, net																		(1,491)		(978)		(574)
Amortization of Intangible Assets and Fair Value Step-up on Film and Television Costs	[4]																	(2,846)		(1,595)		0
Equity Method Investment, Other than Temporary Impairment	[5]																	0		(538)		(210)
Income (loss) from continuing operations before income taxes		(580)		$ (4,840)		$ 1,051		$ 2,626		1,247		$ 2,009		$ 7,236		$ 3,431		(1,743)		13,923		14,729
Capital expenditures																		4,022		4,876		4,465
Depreciation expense																		3,140		2,844		2,758
Amortization of Intangible Assets																		2,205		1,323		253
Identifiable assets		201,549								193,984								201,549		193,984
Long-lived assets		161,581								162,170								161,581		162,170
Americas
Segment Reporting Information [Line Items]
Revenues																		51,992		53,805		46,877
Segment operating income																		5,819		10,247		11,898
Long-lived assets	[6]	141,674								138,674								141,674		138,674
Europe
Segment Reporting Information [Line Items]
Revenues																		7,333		8,006		7,026
Segment operating income																		1,273		2,433		1,922
Long-lived assets	[6]	7,672								10,793								7,672		10,793
Asia Pacific
Segment Reporting Information [Line Items]
Revenues																		6,063		7,796		5,531
Segment operating income																		1,016		2,167		1,869
Long-lived assets	[6]	12,235								12,703								12,235		12,703
Intersegment
Segment Reporting Information [Line Items]
Revenues																		(2,956)		(1,205)
Media Networks
Segment Reporting Information [Line Items]
Revenues																		28,393		24,827		21,922
Segment operating income																		9,022		7,479		7,338
Depreciation expense																		203		191		199
Amortization of Intangible Assets																		4		0		0
Identifiable assets	[7]	62,220								63,519								62,220		63,519
Media Networks | Americas
Segment Reporting Information [Line Items]
Revenues																		26,566		23,767
Media Networks | Europe
Segment Reporting Information [Line Items]
Revenues																		1,378		785
Media Networks | Asia Pacific
Segment Reporting Information [Line Items]
Revenues																		449		275
Media Networks | Cable
Segment Reporting Information [Line Items]
Capital expenditures																		61		93		96
Media Networks | Broadcasting
Segment Reporting Information [Line Items]
Capital expenditures																		51		81		107
Parks, Experiences and Products
Segment Reporting Information [Line Items]
Revenues																		16,502		26,225		24,701
Segment operating income																		(81)		6,758		6,095
Amortization of Intangible Assets																		109		108		110
Identifiable assets	[7]	42,320								41,978								42,320		41,978
Parks, Experiences and Products | Domestic
Segment Reporting Information [Line Items]
Capital expenditures																		2,145		3,294		3,223
Depreciation expense																		1,634		1,474		1,449
Parks, Experiences and Products | International
Segment Reporting Information [Line Items]
Capital expenditures																		759		852		677
Depreciation expense																		694		724		768
Parks, Experiences and Products | Americas
Segment Reporting Information [Line Items]
Revenues																		12,524		19,868
Parks, Experiences and Products | Europe
Segment Reporting Information [Line Items]
Revenues																		1,982		3,135
Parks, Experiences and Products | Asia Pacific
Segment Reporting Information [Line Items]
Revenues																		1,996		3,222
Parks, Experiences and Products | Intersegment
Segment Reporting Information [Line Items]
Revenues																		(536)		(561)		(556)
Parks, Experiences and Products | Third Parties
Segment Reporting Information [Line Items]
Revenues																		17,038		26,786		25,257
Studio Entertainment
Segment Reporting Information [Line Items]
Revenues																		9,636		11,127		10,065
Segment operating income																		2,501		2,686		3,004
Capital expenditures																		77		88		96
Depreciation expense																		87		74		55
Amortization of Intangible Assets																		59		61		64
Identifiable assets	[7]	32,811								34,323								32,811		34,323
Studio Entertainment | Americas
Segment Reporting Information [Line Items]
Revenues																		5,671		6,050
Studio Entertainment | Europe
Segment Reporting Information [Line Items]
Revenues																		2,609		2,956
Studio Entertainment | Asia Pacific
Segment Reporting Information [Line Items]
Revenues																		1,356		2,121
Studio Entertainment | Intersegment
Segment Reporting Information [Line Items]
Revenues																		536		561		556
Studio Entertainment | Third Parties
Segment Reporting Information [Line Items]
Revenues																		9,100		10,566		9,509
Direct-to-Consumer & International
Segment Reporting Information [Line Items]
Revenues																		16,967		9,386		3,414
Segment operating income																		(2,806)		(1,835)		(738)
Capital expenditures																		594		258		107
Depreciation expense																		348		214		106
Amortization of Intangible Assets																		112		111		79
Identifiable assets	[7]	45,538								48,606								45,538		48,606
Direct-to-Consumer & International | Americas
Segment Reporting Information [Line Items]
Revenues																		12,498		5,759
Direct-to-Consumer & International | Europe
Segment Reporting Information [Line Items]
Revenues																		2,016		1,260
Direct-to-Consumer & International | Asia Pacific
Segment Reporting Information [Line Items]
Revenues																		2,453		2,367
Total Segments
Segment Reporting Information [Line Items]
Depreciation expense																		2,966		2,677		2,577
Amortization of Intangible Assets																		284		280		253
TFCF and Hulu
Segment Reporting Information [Line Items]
Amortization of Intangible Assets																		1,921		1,043		0
Corporate
Segment Reporting Information [Line Items]
Capital expenditures																		335		210		159
Depreciation expense																		174		167		181
Identifiable assets	[7],[8]	19,691								6,025								19,691		6,025
Eliminations
Segment Reporting Information [Line Items]
Revenues	[9]																	(6,110)		(1,958)		(668)
Segment operating income	[9]																	(528)		(241)		$ (10)
Identifiable assets	[7]	$ (1,031)								$ (467)								(1,031)		(467)
Eliminations | Americas
Segment Reporting Information [Line Items]
Revenues																		(5,267)		(1,639)
Eliminations | Europe
Segment Reporting Information [Line Items]
Revenues																		(652)		(130)
Eliminations | Asia Pacific
Segment Reporting Information [Line Items]
Revenues																		$ (191)		$ (189)

[1] On March 20, 2019, the Company began consolidating the results of TFCF and Hulu (see Note 4). As a result, revenues and operating results in fiscal 2020 and the third and fourth quarter of fiscal 2019 reflected the impact of this transaction.

[2] 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.

[3] Equity in the income (loss) of investees is as follows: 202020192018Media Networks$737  $703  $711   Parks, Experiences and Products (19) (13) (23) Studio Entertainment(1) —  —  Direct-to-Consumer & International(40) (240) (580)  Equity in the income of investees included in segment operating income 677  450  108   Impairment of equity investments —  (538) (210)  Amortization of TFCF intangible assets related to equity investees (26) (15) —  Equity in the income (loss) of investees$651  $(103) $(102) 

[4] For fiscal 2020, amortization of intangible assets, fair value step-up on film and television costs and intangibles related to TFCF equity investees were $1,921 million, $899 million and $26 million respectively. For fiscal 2019, amortization of intangible assets, fair value step-up on film and television costs and intangibles related to TFCF equity investees were $1,043 million, $537 million and $15 million, respectively.

[5] Impairment of equity investments for fiscal 2019 primarily reflects the impairments of Vice Group Holding Inc. and of an investment in a cable channel at A+E Television Networks ($353 million and $170 million, respectively). Impairment of equity investments for fiscal 2018 reflects impairments of Vice Group Holding Inc. and Villages Nature ($157 million and $53 million, respectively).

[6] Long-lived assets are total assets less: current assets, long-term receivables, deferred taxes, financial investments and the fair value of derivative instruments.

[7] Equity method investments included in identifiable assets by segment are as follows: October 3, 2020September 28, 2019Media Networks$2,002  $2,018  Parks, Experiences and Products3  3  Studio Entertainment2  8  Direct-to-Consumer & International570  821  Corporate55  72  $2,632  $2,922   Intangible assets included in identifiable assets by segment are as follows: October 3, 2020September 28, 2019Media Networks$7,242  $7,861  Parks, Experiences and Products3,066  3,177  Studio Entertainment2,031  2,140  Direct-to-Consumer & International6,814  9,962  Corporate20  75  $19,173  $23,215  

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

[9] Intersegment content transactions are as follows: 202020192018Revenues:Studio Entertainment:Content transactions with Media Networks$(188) $(106) $(169)  Content transactions with Direct-to-Consumer & International (2,108) (272) (28) Media Networks: Content transactions with Direct-to-Consumer & International (3,814) (1,580) (471) Total$(6,110) $(1,958) $(668) Operating Income:Studio Entertainment:Content transactions with Media Networks$3  $(19) $(8)  Content transactions with Direct-to-Consumer & International (158) (80) —  Media Networks: Content transactions with Direct-to-Consumer & International (373) (142) (2) Total$(528) $(241) $(10)