Equity - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended			12 Months Ended
	Dec. 29, 2012	Mar. 31, 2012	Apr. 02, 2011	Sep. 28, 2013	Sep. 29, 2012	Oct. 01, 2011	Mar. 22, 2011
Equity [Abstract]
Dividend paid, per share	$ 0.75	$ 0.6	$ 0.4
Dividend paid	$ 1,300,000,000	$ 1,100,000,000	$ 800,000,000
Common stock repurchases, shares				71	72	135
Common stock repurchases				4,087,000,000	3,015,000,000	4,993,000,000
Total shares authorized for repurchase							400
Remaining shares authorized for repurchase				161
Available-for-sale securities, unrecognized gain positions				$ 228,000,000	$ 0