Property, Plant And Equipment (Details) - USD ($) $ in Millions	Mar. 28, 2020	Sep. 28, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 15,133	$ 14,650
Less accumulated depreciation	7,669	7,368
Net property, plant and equipment	7,464	7,282
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	197	198
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,801	4,747
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,820	8,607
Land improvements and other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	395	385
Buildings and equipment under construction
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 920	$ 713