Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Numerator:
Net income	$ 13,072	$ 13,078
Denominator:
Weighted-average shares outstanding	896,072	938,916
Effect of dilutive securities	5,380	8,301
Weighted-average diluted shares	901,452	947,217
Basic earnings per share	$ 14.59	$ 13.93
Diluted earnings per share	$ 14.50	$ 13.81