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Property, Plant And Equipment, Net
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant And Equipment, Net PROPERTY, PLANT AND EQUIPMENT, NET
Property, plant and equipment (PP&E) is carried at historical cost, net of accumulated depreciation. PP&E by major asset class consisted of the following:
December 3120202019
Machinery and equipment$5,941 $5,441 
Buildings and improvements3,558 3,232 
Construction in process802 688 
Land and improvements413 400 
Total PP&E10,714 9,761 
Accumulated depreciation(5,614)(5,286)
PP&E, net$5,100 $4,475 
We depreciate most of our assets using the straight-line method and the remainder using accelerated methods. Buildings and improvements are depreciated over periods of up to 50 years. Machinery and equipment are depreciated over periods of up to 30 years. Our government customers provide certain facilities and equipment for our use that are not included above.