(Dollars in Millions) | 2013 | 2012 | |||||
Land and land improvements | $ | 885 | 793 | ||||
Buildings and building equipment | 10,423 | 10,046 | |||||
Machinery and equipment | 22,527 | 21,075 | |||||
Construction in progress | 3,298 | 2,740 | |||||
Total property, plant and equipment, gross | $ | 37,133 | 34,654 | ||||
Less accumulated depreciation | 20,423 | 18,557 | |||||
Total property, plant and equipment, net | $ | 16,710 | 16,097 |