Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Land	$ 530	$ 535
Buildings and land improvements	14,125	13,796
Machinery and equipment	14,577	13,569
Construction in progress	1,081	1,790
Gross property, plant and equipment	30,313	29,690
Less accumulated depreciation	(17,641)	(16,883)
Total	$ 12,672	$ 12,807