Supplemental Balance Sheet Data - Property Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Land	$ 192	$ 196
Buildings and Improvements, Gross	2,753	2,776
Machinery and Equipment, Gross	14,296	14,193
Construction in Progress, Gross	474	515
Property, Plant and Equipment, Gross	17,715	17,680
Less accumulated depreciation	(9,874)	(9,732)
Total	$ 7,841	$ 7,948