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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 29, 2018 USD ($)	Oct. 02, 2021 USD ($) derivatives	Oct. 03, 2020 USD ($)	Sep. 28, 2019 USD ($)	Aug. 31, 2021 USD ($)	May 13, 2019 USD ($)	Mar. 20, 2019	Sep. 25, 2017 USD ($)
Indefinite-lived Intangible Assets [Line Items]
Advertising expense		$ 5,500	$ 4,700	$ 4,300
Amortization of Film Library Maximum Period		20 years
Internal-Use software costs capitalized, net of accumulated depreciation		$ 1,186	778
Impairment of Intangible Assets (Excluding Goodwill)		$ 300	5,200	$ 600
Goodwill, Impairment Loss			3,074
Number of Types of Derivatives \| derivatives		2
Redeemable noncontrolling interest		$ 9,213	9,249
Cumulative Effect, Period of Adoption, Adjustment
Indefinite-lived Intangible Assets [Line Items]
Impact of New Accounting Pronouncement on Retained Earnings	$ 116
International Channels
Indefinite-lived Intangible Assets [Line Items]
Goodwill, Impairment Loss			3,100
Distribution Rights \| International Channels
Indefinite-lived Intangible Assets [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)			$ 1,900
BAMTech, LLC
Indefinite-lived Intangible Assets [Line Items]
Equity Method Investment, Ownership Interest		85.00%			75.00%
Hulu LLC
Indefinite-lived Intangible Assets [Line Items]
Equity Method Investment, Ownership Interest		67.00%					60.00%
Equity Interest Held by NBC Universal \| Hulu LLC
Indefinite-lived Intangible Assets [Line Items]
Equity Method Investment, Ownership Interest		33.00%
MLB \| BAMTech, LLC
Indefinite-lived Intangible Assets [Line Items]
Equity Method Investment, Ownership Interest		15.00%			15.00%
Redeemable Noncontrolling Interest, Equity, Redemption Value		$ 820
NHL \| BAMTech, LLC
Indefinite-lived Intangible Assets [Line Items]
Equity Method Investment, Ownership Interest					10.00%
Redeemable Noncontrolling Interest, Equity, Redemption Value					$ 350
Minimum
Indefinite-lived Intangible Assets [Line Items]
Amortizable intangible assets, maximum amortization period		40 years
Minimum \| Equity Interest Held by NBC Universal \| Hulu LLC
Indefinite-lived Intangible Assets [Line Items]
Redeemable Noncontrolling Interest, Equity, Redemption Value						$ 27,500
Redeemable noncontrolling interest		$ 8,400
Minimum \| MLB \| BAMTech, LLC
Indefinite-lived Intangible Assets [Line Items]
Redeemable Noncontrolling Interest, Equity, Redemption Value								$ 563
Preferred Stock Return on NCI, Accretion Percentage								8.00%
Attractions, Buildings and Improvements \| Minimum
Indefinite-lived Intangible Assets [Line Items]
Property, Plant and Equipment, Useful Life		20 years
Attractions, Buildings and Improvements \| Maximum
Indefinite-lived Intangible Assets [Line Items]
Property, Plant and Equipment, Useful Life		40 years
Software and Software Development Costs \| Maximum
Indefinite-lived Intangible Assets [Line Items]
Property, Plant and Equipment, Useful Life		7 years