Fixed Assets

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Fixed Assets

FIXED ASSETS

(dollars in millions)	Estimated Useful Lives	2019		2018
Land		$	447	$	425
Buildings and improvements	12-40 years	6,673		6,486
Machinery, tools and equipment	3-20 years	16,353		15,119
Other, including assets under construction		2,213		2,054
		25,686		24,084
Accumulated depreciation		(12,931)		(11,787)
		$	12,755	$	12,297

Depreciation expense is recorded predominantly utilizing the straight-line method and was $1,506 million in 2019, $1,240 million in 2018 and $1,178 million in 2017.