Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	12 Months Ended
	Oct. 03, 2015 USD ($) derivatives	Sep. 27, 2014 USD ($)	Sep. 28, 2013 USD ($)
Indefinite-lived Intangible Assets [Line Items]
Deferred Revenue Recognition Multi Day Tickets Period	5 years
Advertising expense	$ 2,600	$ 2,800	$ 2,600
Ultimate Revenues from Theatrical Release Maximum Period	10 years
Ultimate Revenues from TV Series Delivery of First Episode Maximum Period	10 years
Ultimate Revenues from TV Series Delivery of Recent Episode Maximum Period	5 years
Amortization Film Library Maximum Period	20 years
Film Development Write Off Maximum Period	3 years
Internal-Use software costs capitalized, net of accumulated depreciation	$ 753	761
Impairment of Intangible Assets (Excluding Goodwill)	$ 10		$ 5
Number of Types of Derivatives | derivatives	2
Measurement of tax benefit, minimum likelihood of largest amount being realized upon ultimate settlement	50.00%
Radio FCC Licenses | Media Networks
Indefinite-lived Intangible Assets [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)		$ 46
Maximum
Indefinite-lived Intangible Assets [Line Items]
Amortizable intangible assets, maximum amortization period	40 years