Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Schedule Of Property, Plant And Equipment

The provision for depreciation has been computed principally by the straight-line method based on the estimated useful lives of the depreciable assets as follows:

Category	Useful Life
Buildings	30 years
Leased assets and leasehold improvements	Amortized over the lesser of the economic life of the asset or the term of the lease
Machinery and equipment	3 – 10 years
Customer-leased instruments	5 – 7 years

The classes of property, plant and equipment as of December 31 are summarized as follows ($ in millions):

	2020		2019
Land and improvements	$	192	$	149
Buildings	1,522		954
Machinery and equipment	2,881		2,194
Customer-leased equipment	1,849		1,766
Gross property, plant and equipment	6,444		5,063
Less: accumulated depreciation	3,182		2,761
Property, plant and equipment, net	$	3,262	$	2,302