Segments of Business and Geographic Areas (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 29, 2015	Mar. 30, 2014
Sales by geographic area
Sales	$ 17,374	$ 18,115
Percentage Change In Sales By Geographic Area	(4.10%)
UNITED STATES
Sales by geographic area
Sales	8,692	8,204
Percentage Change In Sales By Geographic Area	5.90%
Europe
Sales by geographic area
Sales	4,040	4,885
Percentage Change In Sales By Geographic Area	(17.30%)
Western Hemisphere, excluding U.S.
Sales by geographic area
Sales	1,639	1,695
Percentage Change In Sales By Geographic Area	(3.30%)
Asia-Pacific, Africa
Sales by geographic area
Sales	$ 3,003	$ 3,331
Percentage Change In Sales By Geographic Area	(9.80%)