Debt - Additional Information (Detail) (USD $)	12 Months Ended						12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Jun. 28, 2014 2014 Debt Issuance	Jun. 29, 2013 2013 Debt Issuance	Jun. 28, 2014 Interest Rate Swap	Jun. 29, 2013 Interest Rate Swap	Sep. 27, 2014 Maximum	Sep. 27, 2014 Level 2	Sep. 28, 2013 Level 2
Debt Instrument [Line Items]
Commercial paper	$ 6,308,000,000	$ 0
Commercial paper, weighted-average interest rate	0.12%
Commercial paper, maturity period							9 months
Debt instrument aggregate principal amount	29,000,000,000	17,000,000,000	12,000,000,000	17,000,000,000
Notional Amount					9,000,000,000	3,000,000,000
Interest expense	381,000,000	136,000,000
Debt instrument fair value								$ 28,500,000,000	$ 15,900,000,000