Segment and Geographic Data (Details 3) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 25, 2015	Jun. 26, 2015	Mar. 27, 2015	Dec. 26, 2014	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013
Segment and Geographic Data
Net sales	$ 2,984	$ 3,118	$ 3,082	$ 3,049	$ 3,072	$ 3,075	$ 2,964	$ 2,862	$ 12,233	$ 11,973	$ 11,390
Property, Plant, and Equipment, Net	2,920				2,920				2,920	2,920	2,951
Switzerland
Segment and Geographic Data
Net sales									2,992	3,483	3,216
Property, Plant, and Equipment, Net	55				54				55	54	54
Germany
Segment and Geographic Data
Net sales									117	126	123
Property, Plant, and Equipment, Net	313				330				313	330	346
Other Europe/Middle East/Africa
Segment and Geographic Data
Net sales									883	615	609
Property, Plant, and Equipment, Net	588				642				588	642	650
Total Europe/Middle East/Africa
Segment and Geographic Data
Net sales									3,992	4,224	3,948
Property, Plant, and Equipment, Net	956				1,026				956	1,026	1,050
China
Segment and Geographic Data
Net sales									2,367	2,331	2,072
Property, Plant, and Equipment, Net	529				492				529	492	495
Other Asia-Pacific
Segment and Geographic Data
Net sales									1,736	1,903	1,914
Property, Plant, and Equipment, Net	461				468				461	468	490
Total Asia-Pacific
Segment and Geographic Data
Net sales									4,103	4,234	3,986
Property, Plant, and Equipment, Net	990				960				990	960	985
U.S.
Segment and Geographic Data
Net sales									3,817	3,119	3,042
Property, Plant, and Equipment, Net	887				837				887	837	867
Other Americas
Segment and Geographic Data
Net sales									321	396	414
Property, Plant, and Equipment, Net	87				97				87	97	49
Total Americas
Segment and Geographic Data
Net sales									4,138	3,515	3,456
Property, Plant, and Equipment, Net	$ 974				$ 934				$ 974	$ 934	$ 916