Property, Plant and Equipment, Net

9 Months Ended

Sep. 30, 2021

Property, Plant and Equipment, Net.

Property, Plant and Equipment, Net

10.     Property, Plant and Equipment, Net

	September 30,		December 31,
($ in millions)	2021		2020
Land	$	165	$	163
Buildings		1,944		1,653
Machinery and equipment		6,736		6,214
Construction-in-progress		1,130		883
		9,975		8,913
Accumulated depreciation		(3,805)		(3,562)
	$	6,170	$	5,351

Depreciation expense amounted to $130 million and $115 million for the three months ended September 30, 2021 and 2020, respectively, and $380 million and $365 million for the nine months ended September 30, 2021 and 2020, respectively.