Segment Information and Geographic Data - Long-Lived Assets (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 24, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 33,783	$ 27,010
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	20,637	16,364
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	10,211	7,875
Other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 2,935	$ 2,771