Segment and Geographic Data - By Region (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 24, 2016	Mar. 25, 2016	Dec. 25, 2015	Sep. 25, 2015	Jun. 26, 2015	Mar. 27, 2015	Dec. 26, 2014	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Segment Data
Net sales	$ 3,332	$ 3,121	$ 2,952	$ 2,833	$ 2,984	$ 3,118	$ 3,082	$ 3,049	$ 12,238	$ 12,233	$ 11,973
Property, Plant, and Equipment, Net	3,052				2,920				3,052	2,920	2,920
U.S.
Segment Data
Net sales									3,901	3,817	3,119
Property, Plant, and Equipment, Net	922				887				922	887	837
Other Americas
Segment Data
Net sales									298	321	396
Property, Plant, and Equipment, Net	93				87				93	87	97
Total Americas
Segment Data
Net sales									4,199	4,138	3,515
Property, Plant, and Equipment, Net	1,015				974				1,015	974	934
Switzerland
Segment Data
Net sales									2,979	2,992	3,483
Property, Plant, and Equipment, Net	62				55				62	55	54
Germany
Segment Data
Net sales									127	117	126
Property, Plant, and Equipment, Net	334				313				334	313	330
Other Europe/Middle East/Africa
Segment Data
Net sales									1,010	883	615
Property, Plant, and Equipment, Net	630				588				630	588	642
Total Europe/Middle East/Africa
Segment Data
Net sales									4,116	3,992	4,224
Property, Plant, and Equipment, Net	1,026				956				1,026	956	1,026
China
Segment Data
Net sales									2,165	2,367	2,331
Property, Plant, and Equipment, Net	491				529				491	529	492
Other Asia-Pacific
Segment Data
Net sales									1,758	1,736	1,903
Property, Plant, and Equipment, Net	520				461				520	461	468
Total Asia-Pacific
Segment Data
Net sales									3,923	4,103	4,234
Property, Plant, and Equipment, Net	$ 1,011				$ 990				$ 1,011	$ 990	$ 960