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Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Abstract]    
Land $ 512 $ 527
Buildings and land improvements 14,415 14,288
Machinery and equipment 16,060 15,723
Construction in progress 1,340 1,306
Gross property, plant and equipment 32,327 31,844
Less accumulated depreciation (20,507) (19,342)
Total $ 11,820 $ 12,502