Miscellaneous Financial Information (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Miscellaneous Financial Information [Abstract]
Research and development expense	$ 1,042,000,000	$ 1,044,000,000	$ 1,012,000,000
Foreign currency transaction losses, before tax		184,000,000	251,000,000
Foreign currency transaction gains, before tax	159,000,000
Gains on combined effects of LIFO inventory accumulations and draw-downs	328,000,000	292,000,000	317,000,000
Replacement cost of inventories estimated to exceed LIFO carrying values	$ 21,300,000,000	$ 25,600,000,000