Property, Plant, and Equipment, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Net property, plant, and equipment
Gross property, plant, and equipment	$ 8,888	$ 8,637
Accumulated depreciation	(5,836)	(5,717)
Property, plant, and equipment, net	3,052	2,920	$ 2,920
Depreciation expense	436	463	$ 467
Land and improvements
Net property, plant, and equipment
Gross property, plant, and equipment	159	163
Buildings and improvements
Net property, plant, and equipment
Gross property, plant, and equipment	1,272	1,261
Machinery and equipment
Net property, plant, and equipment
Gross property, plant, and equipment	6,890	6,692
Construction in process
Net property, plant, and equipment
Gross property, plant, and equipment	$ 567	$ 521