Segment Information and Geographic Data - Net Sales (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Sep. 24, 2016	Jun. 25, 2016	Mar. 26, 2016	Dec. 26, 2015	Sep. 30, 2017	Sep. 24, 2016	Sep. 26, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 52,579	$ 45,408	$ 52,896	$ 78,351	$ 46,852	$ 42,358	$ 50,557	$ 75,872	$ 229,234	$ 215,639	$ 233,715
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									84,339	75,667	81,732
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									44,764	48,492	58,715
Other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 100,131	$ 91,480	$ 93,268