Segment Reporting (Information by Geographic Area) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Jan. 01, 2017	Sep. 30, 2018	Oct. 01, 2017	Oct. 02, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 6,303.6	$ 6,310.3	$ 6,031.8	$ 6,073.7	$ 5,698.3	$ 5,661.5	$ 5,294.0	$ 5,732.9	$ 24,719.5	$ 22,386.8	$ 21,315.9
Long-lived assets	11,662.2				9,082.3				11,662.2	9,082.3	9,554.6
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									17,409.4	16,527.1	15,774.8
Long-lived assets	5,635.9				5,848.3				5,635.9	5,848.3	6,012.8
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									7,310.1	5,859.7	5,541.1
Long-lived assets	$ 6,026.3				$ 3,234.0				$ 6,026.3	$ 3,234.0	$ 3,541.8