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Debt - Additional Information (Detail) $ in Millions, ¥ in Billions	3 Months Ended
	Dec. 26, 2015 USD ($)	Dec. 27, 2014 USD ($)	Dec. 26, 2015 JPY (¥)	Sep. 26, 2015 USD ($)
Debt Instrument [Line Items]
Commercial paper	$ 7,259			$ 8,499
Debt instrument aggregate principal amount	55,548			55,701
Interest expense	271	$ 128
Net investment hedges \| Third quarter 2015 Japanese yen-denominated debt issuance
Debt Instrument [Line Items]
Debt instrument, face amount \| ¥			¥ 118.0
Debt instrument, senior notes	$ 1,000			$ 2,100
Commercial paper
Debt Instrument [Line Items]
Commercial paper, weighted-average interest rate	0.20%		0.20%	0.14%
Commercial paper \| Maximum
Debt Instrument [Line Items]
Commercial paper, maturity period	9 months
Level 2
Debt Instrument [Line Items]
Debt instrument fair value	$ 55,100			$ 54,900