Segment Reporting (Information by Geographic Area) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 27, 2020	Sep. 29, 2019	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 6,203.1	$ 4,222.1	$ 5,995.7	$ 7,097.1	$ 6,747.0	$ 6,823.0	$ 6,305.9	$ 6,632.7	$ 23,518.0	$ 26,508.6	$ 24,719.5
Long-lived assets	21,568.1				13,565.7				21,568.1	13,565.7	11,662.2
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									16,879.8	18,622.7	17,409.4
Long-lived assets	12,624.9				7,330.2				12,624.9	7,330.2	5,635.9
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									4,055.4	5,013.9	4,954.3
Long-lived assets	4,517.6				2,955.7				4,517.6	2,955.7	2,551.7
CHINA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									2,582.8	2,872.0	2,355.8
Long-lived assets	$ 4,425.6				$ 3,279.8				$ 4,425.6	$ 3,279.8	$ 3,474.6