Acquired Intangible Assets - Components of Gross and Net Intangible Asset Balances (Details) - USD ($) $ in Millions	Dec. 30, 2017	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Total acquired intangible assets, gross carrying amount	$ 7,640	$ 7,607
Definite-lived and amortizable acquired intangible assets, gross carrying amount	7,540	7,507
Definite-lived and amortizable acquired intangible assets, accumulated amortization	(5,491)	(5,309)
Definite-lived and amortizable acquired intangible assets, net carrying amount	2,049	2,198
Indefinite-lived and non-amortizable acquired intangible assets	100	100
Total acquired intangible assets, net carrying amount	$ 2,149	$ 2,298