Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions		12 Months Ended
	Jul. 31, 2014	Sep. 26, 2015	Sep. 27, 2014	Sep. 28, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Business acquisitions, aggregate cash consideration paid, net of cash acquired		$ 343	$ 3,765	$ 496
Amortization expense related to acquired intangible assets		$ 1,300	1,100	$ 960
Weighted-average amortization period for acquired intangible assets		3 years 7 months 6 days
Beats
Acquired Finite-Lived Intangible Assets [Line Items]
Business acquisitions, total purchase price consideration	$ 2,600
Business acquisitions allocated to goodwill	2,200
Business acquisitions allocated to intangible assets	636
Business acquisitions allocated to net liabilities assumed	258
Repayment of the outstanding debt of acquired entity	$ 295
Beats | Restricted Stock
Acquired Finite-Lived Intangible Assets [Line Items]
Common stock issued in connection with the acquisition, shares	5.1
Common stock issued in connection with the acquisition	$ 485
Beats | Restricted Stock | Vesting over time, based on continued employment of certain executives
Acquired Finite-Lived Intangible Assets [Line Items]
Common stock issued in connection with the acquisition	$ 417
Various Business Acquisitions
Acquired Finite-Lived Intangible Assets [Line Items]
Business acquisitions allocated to goodwill			828
Business acquisitions allocated to intangible assets			257
Business acquisitions allocated to net liabilities assumed			128
Business acquisitions, aggregate cash consideration paid, net of cash acquired			$ 957
Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Amortized acquired intangible assets with definite lives useful period (in years)		3 years
Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Amortized acquired intangible assets with definite lives useful period (in years)		7 years