Income Tax Expense / (Benefit) (Detail) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Current
Federal		$ 3,229	$ 3,146	$ 4,182
State		360	154	333
Foreign	[1]	489	533	525
Current Income Tax Expense (Benefit), Total		4,078	3,833	5,040
Deferred
Federal		370	1,172	82
State		5	100	(52)
Foreign		(31)	(27)	(54)
Deferred Income Tax Expense (Benefit), Total		344	1,245	(24)
Income taxes		$ 4,422	$ 5,078	$ 5,016

[1] Includes foreign withholding taxes