Property, Plant and Equipment (Details) - USD ($) $ in Millions	Jun. 24, 2016	Sep. 25, 2015
Property, Plant and Equipment:
Accumulated depreciation	$ (2,392)	$ (2,501)
Property, plant and equipment, net	1,180	1,166
Land
Property, Plant and Equipment:
Property, plant and equipment	33	33
Buildings
Property, Plant and Equipment:
Property, plant and equipment	433	403
Subscriber systems
Property, Plant and Equipment:
Property, plant and equipment	1,720	1,916
Machinery and equipment
Property, Plant and Equipment:
Property, plant and equipment	1,279	1,234
Construction in progress
Property, Plant and Equipment:
Property, plant and equipment	$ 107	$ 81