Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment at Cost and Accumulated Depreciation

At the end of 2017 and 2016, property, plant and equipment at cost and accumulated depreciation were:

(Dollars in Millions)	2017		2016
Land and land improvements	$	829	753
Buildings and building equipment	11,240		10,112
Machinery and equipment	25,949		23,554
Construction in progress	3,448		3,354
Total property, plant and equipment, gross	$	41,466	37,773
Less accumulated depreciation	24,461		21,861
Total property, plant and equipment, net	$	17,005	15,912