Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Numerator:
Net income	$ 7,796	$ 10,677	$ 36,673	$ 42,270
Denominator:
Weighted-average shares outstanding (in shares)	5,443,058	5,729,886	5,505,456	5,788,922
Effect of dilutive securities (in shares)	29,723	43,213	30,475	40,998
Weighted-average diluted shares (in shares)	5,472,781	5,773,099	5,535,931	5,829,920
Basic earnings per share (in dollars per share)	$ 1.43	$ 1.86	$ 6.66	$ 7.30
Diluted earnings per share (in dollars per share)	$ 1.42	$ 1.85	$ 6.62	$ 7.25