Segment Information and Geographic Data - Net Sales (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Sep. 29, 2018	Sep. 30, 2017	Sep. 24, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 62,900	$ 53,265	$ 61,137	$ 88,293	$ 52,579	$ 45,408	$ 52,896	$ 78,351	$ 265,595	$ 229,234	$ 215,639
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									98,061	84,339	75,667
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									51,942	44,764	48,492
Other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 115,592	$ 100,131	$ 91,480