Description of the Business and Segment Information - Financial Information by Operating Segments (Parenthetical) (Detail) - USD ($) $ in Millions		3 Months Ended																12 Months Ended
		Oct. 03, 2020		Jun. 27, 2020	[1]	Mar. 28, 2020	[1]	Dec. 28, 2019	[1]	Sep. 28, 2019		Jun. 29, 2019	[1]	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		$ 18,025		$ 20,877		$ 19,118	[1]	$ 20,262		$ 14,924		$ 15,303		$ 65,388		$ 69,607		$ 59,434
Segment operating income		606	[1],[2]	$ 1,099	[2]	$ 2,407	[2]	$ 3,996	[2]	3,425	[1],[2]	$ 3,952	[2]	$ 3,815	[2]	$ 3,655	[2]	8,108	[3]	14,847	[3]	15,689	[3]
Equity in the income (loss) of investees																		651		(103)		(102)
Equity Method Investment, Other than Temporary Impairment	[4]																	0		(538)		(210)
Amortization of Intangible Assets Held by Equity Investees																		(26)		(15)		0
Amortization of Intangible Assets																		2,205		1,323		253
Equity Method Investments		2,632								2,922								2,632		2,922
Goodwill and intangible assets		19,173								23,215								19,173		23,215
TFCF and Hulu
Segment Reporting Information [Line Items]
Amortization of Intangible Assets Held by Equity Investees																		26		15
Amortization of Intangible Assets																		1,921		1,043
Amortization																		899		537
Intersegment transactions
Segment Reporting Information [Line Items]
Revenues																		(6,110)		(1,958)		(668)
Segment operating income																		(528)		(241)		(10)
Media Networks
Segment Reporting Information [Line Items]
Revenues																		28,393		24,827		21,922
Segment operating income																		9,022		7,479		7,338
Equity in the income (loss) of investees																		737		703		711
Amortization of Intangible Assets																		4		0		0
Equity Method Investments		2,002								2,018								2,002		2,018
Goodwill and intangible assets		7,242								7,861								7,242		7,861
Media Networks | Studio Entertainment intersegment content transactions
Segment Reporting Information [Line Items]
Revenues																		(188)		(106)		(169)
Segment operating income																		3		(19)		(8)
Parks, Experiences and Products
Segment Reporting Information [Line Items]
Revenues																		16,502		26,225		24,701
Segment operating income																		(81)		6,758		6,095
Equity in the income (loss) of investees																		(19)		(13)		(23)
Amortization of Intangible Assets																		109		108		110
Equity Method Investments		3								3								3		3
Goodwill and intangible assets		3,066								3,177								3,066		3,177
Studio Entertainment
Segment Reporting Information [Line Items]
Revenues																		9,636		11,127		10,065
Segment operating income																		2,501		2,686		3,004
Equity in the income (loss) of investees																		(1)		0		0
Amortization of Intangible Assets																		59		61		64
Equity Method Investments		2								8								2		8
Goodwill and intangible assets		2,031								2,140								2,031		2,140
Direct-to-Consumer & International
Segment Reporting Information [Line Items]
Revenues																		16,967		9,386		3,414
Segment operating income																		(2,806)		(1,835)		(738)
Equity in the income (loss) of investees																		(40)		(240)		(580)
Amortization of Intangible Assets																		112		111		79
Equity Method Investments		570								821								570		821
Goodwill and intangible assets		6,814								9,962								6,814		9,962
Direct-to-Consumer & International | Studio Entertainment intersegment content transactions
Segment Reporting Information [Line Items]
Revenues																		(2,108)		(272)		(28)
Segment operating income																		(158)		(80)		0
Direct-to-Consumer & International | Media Networks intersegment content transactions
Segment Reporting Information [Line Items]
Revenues																		(3,814)		(1,580)		(471)
Segment operating income																		(373)		(142)		(2)
Corporate
Segment Reporting Information [Line Items]
Equity Method Investments		55								72								55		72
Goodwill and intangible assets		$ 20								$ 75								20		75
Total Segments
Segment Reporting Information [Line Items]
Equity in the income (loss) of investees																		677		450		108
Amortization of Intangible Assets																		$ 284		280		253
Vice Media
Segment Reporting Information [Line Items]
Equity Method Investment, Other than Temporary Impairment																				(353)		(157)
Villages Nature
Segment Reporting Information [Line Items]
Equity Method Investment, Other than Temporary Impairment																						$ (53)
A&E | Viceland
Segment Reporting Information [Line Items]
Equity Method Investment, Other than Temporary Impairment																				$ (170)

[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] 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).