Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Numerator:
Net income	$ 11,253	$ 10,044	$ 44,738	$ 41,570
Denominator:
Weighted-average basic shares outstanding (in shares)	4,312,573	4,570,633	4,362,571	4,660,175
Effect of dilutive securities (in shares)	42,215	30,747	42,124	31,584
Weighted-average diluted shares (in shares)	4,354,788	4,601,380	4,404,695	4,691,759
Basic earnings per share (in dollars per share)	$ 2.61	$ 2.20	$ 10.25	$ 8.92
Diluted earnings per share (in dollars per share)	$ 2.58	$ 2.18	$ 10.16	$ 8.86