Income Tax Expense / (Benefit) (Detail) - USD ($) $ in Millions		12 Months Ended
		Oct. 01, 2016	Oct. 03, 2015	Sep. 27, 2014
Current
Federal		$ 3,146	$ 4,182	$ 2,932
State		154	333	206
Foreign	[1]	533	525	600
Current Income Tax Expense (Benefit), Total		3,833	5,040	3,738
Deferred
Federal		1,172	82	409
State		100	(52)	81
Foreign		(27)	(54)	14
Deferred Income Tax Expense (Benefit), Total		1,245	(24)	504
Income taxes		$ 5,078	$ 5,016	$ 4,242

[1] Includes foreign withholding taxes