Segments of Business and Geographic Areas - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Sales by geographic area
Sales	$ 20,348	$ 19,650	$ 61,187	$ 56,255
Percentage Change In Sales By Geographic Area	3.60%		8.80%
United States
Sales by geographic area
Sales	$ 10,664	10,290	$ 31,255	29,394
Percentage Change In Sales By Geographic Area	3.60%		6.30%
Europe
Sales by geographic area
Sales	$ 4,416	4,308	$ 14,023	12,398
Percentage Change In Sales By Geographic Area	2.50%		13.10%
Western Hemisphere, excluding U.S.
Sales by geographic area
Sales	$ 1,550	1,569	$ 4,657	4,522
Percentage Change In Sales By Geographic Area	(1.20%)		3.00%
Asia-Pacific, Africa
Sales by geographic area
Sales	$ 3,718	$ 3,483	$ 11,252	$ 9,941
Percentage Change In Sales By Geographic Area	6.70%		13.20%