Segment Information and Geographic Data - Net Sales (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 365,817	$ 274,515	$ 260,174
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	133,803	109,197	102,266
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	68,366	40,308	43,678
Other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 163,648	$ 125,010	$ 114,230