Description of the Business and Segment Information - Equity in Income of Investees by Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2016
Schedule of Equity Method Investments [Line Items]
Equity in the income (loss) of investees, net	$ (102)	$ 320	$ 926
Equity Method Investment, Other than Temporary Impairment	(210)	0	0
Vice Media
Schedule of Equity Method Investments [Line Items]
Equity in the income (loss) of investees, net	0	0	332
Equity Method Investment, Other than Temporary Impairment	(157)	0	0
Villages Nature
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Other than Temporary Impairment	(53)	0	0
Media Networks
Schedule of Equity Method Investments [Line Items]
Equity in the income (loss) of investees, net	131	344	597
Parks and Resorts
Schedule of Equity Method Investments [Line Items]
Equity in the income (loss) of investees, net	(23)	(25)	(3)
Consumer Products and Interactive
Schedule of Equity Method Investments [Line Items]
Equity in the income (loss) of investees, net	0	1	0
Total Segments
Schedule of Equity Method Investments [Line Items]
Equity in the income (loss) of investees, net	$ 108	$ 320	$ 594