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Investments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015	Aug. 31, 2016
Schedule of Equity Method Investments [Line Items]
Excess book value of equity method investments representing intangible assets and goodwill	$ 700
Revenue from Related Parties	500	$ 500	$ 400
Securities classified as available-for-sale	36	85
Non-publicly traded cost-method investments	79	91
Investments in leveraged leases		22
Realized gains on available-for-sale securities	15		31
Available-for-sale securities, unrecognized gain positions	18	49
Realized gains on non-publicly traded cost-method investments	7	23	11
Other-than-temporary losses in value of certain investments	$ 8	$ 44	$ 14
A&E
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Interest	50.00%
CTV Specialty Television, Inc.
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Interest	30.00%
Seven TV
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Interest	20.00%
Hulu LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Interest	30.00%		33.00%	30.00%
Vice Media
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Interest	19.00%
Villages Nature
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Interest	50.00%