Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Numerator:
Net income	$ 94,680	$ 57,411	$ 55,256
Denominator:
Weighted-average basic shares outstanding (in shares)	16,701,272	17,352,119	18,471,336
Effect of dilutive securities (in shares)	163,647	176,095	124,315
Weighted-average diluted shares (in shares)	16,864,919	17,528,214	18,595,651
Basic earnings per share (in dollars per share)	$ 5.67	$ 3.31	$ 2.99
Diluted earnings per share (in dollars per share)	$ 5.61	$ 3.28	$ 2.97