Selected Quarterly Financial Information (Unaudited) - Summary of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Selected Quarterly Financial Information [Abstract]
Net sales	$ 64,040	$ 53,809	$ 58,015	$ 84,310	$ 62,900	$ 53,265	$ 61,137	$ 88,293	$ 260,174	$ 265,595	$ 229,234
Gross margin	24,313	20,227	21,821	32,031	24,084	20,421	23,422	33,912	98,392	101,839	88,186
Net income	$ 13,686	$ 10,044	$ 11,561	$ 19,965	$ 14,125	$ 11,519	$ 13,822	$ 20,065	$ 55,256	$ 59,531	$ 48,351
Earnings per share:
Basic (in dollars per share)	$ 3.05	$ 2.20	$ 2.47	$ 4.22	$ 2.94	$ 2.36	$ 2.75	$ 3.92	$ 11.97	$ 12.01	$ 9.27
Diluted (in dollars per share)	$ 3.03	$ 2.18	$ 2.46	$ 4.18	$ 2.91	$ 2.34	$ 2.73	$ 3.89	$ 11.89	$ 11.91	$ 9.21