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		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Sales by geographic area
Sales	$ 20,562	$ 20,830	$ 40,583	$ 40,839
Percentage Change In Sales By Geographic Area	(1.30%)		(0.60%)
United States
Sales by geographic area
Sales	$ 10,403	10,640	$ 20,532	20,591
Percentage Change In Sales By Geographic Area	(2.20%)		(0.30%)
Europe
Sales by geographic area
Sales	$ 4,733	4,810	$ 9,342	9,607
Percentage Change In Sales By Geographic Area	(1.60%)		(2.80%)
Western Hemisphere, excluding U.S.
Sales by geographic area
Sales	$ 1,455	1,540	$ 2,958	3,107
Percentage Change In Sales By Geographic Area	(5.50%)		(4.80%)
Asia-Pacific, Africa
Sales by geographic area
Sales	$ 3,971	$ 3,840	$ 7,751	$ 7,534
Percentage Change In Sales By Geographic Area	3.40%		2.90%