Computation of Basic and Diluted Earnings Per Common Share (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 25, 2011	Jun. 30, 2012	Jun. 25, 2011
Numerator:
Net income	$ 8,824	$ 7,308	$ 33,510	$ 19,299
Denominator:
Weighted-average shares outstanding	936,596	926,108	933,672	922,917
Effect of dilutive securities	10,463	11,702	10,768	12,771
Weighted-average diluted shares	947,059	937,810	944,440	935,688
Basic earnings per common share	$ 9.42	$ 7.89	$ 35.89	$ 20.91
Diluted earnings per common share	$ 9.32	$ 7.79	$ 35.48	$ 20.63