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Property, Plant And Equipment, Net
 12 Months Ended
Dec. 31, 2021
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. Net PP&E by major asset class consisted of the following:
December 3120212020
Machinery and equipment$6,281 $5,941 
Buildings and improvements3,712 3,558 
Construction in process1,057 802 
Land and improvements414 413 
Total PP&E11,464 10,714 
Accumulated depreciation(6,047)(5,614)
PP&E, net$5,417 $5,100 
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.