Property, Plant and Equipment, Net

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment, Net.

Property, Plant and Equipment, Net

10. Property, Plant and Equipment, Net

	December 31,
($ in millions)	2021		2020
Land	$	167	$	163
Buildings		2,081		1,653
Machinery and equipment		6,876		6,214
Construction-in-progress		1,179		883
		10,303		8,913
Accumulated depreciation		(3,801)		(3,562)
	$	6,502	$	5,351

Property, plant and equipment are stated at historical or acquired cost. Depreciation expense amounted to $520 million, $488 million and $491 million for the years ended December 31, 2021, 2020 and 2019, respectively.