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Land, Buildings, Equipment and Software, Net
 12 Months Ended
Dec. 31, 2022
Land, Buildings, Equipment and Software, Net [Abstract]  
Land, Buildings, Equipment and Software, Net Land, Buildings, Equipment and Software, Net
Land, buildings and equipment, net were as follows:
December 31,
 Estimated Useful Lives (Years)20222021
Land$8 $9 
Building and building equipment
25 to 50
708 777 
Leasehold improvements
1 to 12
112 112 
Plant machinery
5 to 12
1,000 1,098 
Office furniture and equipment
3 to 15
460 475 
Finance leases
1 to 12
26 13 
Other
4 to 20
38 44 
Construction in progress15 17 
Subtotal 2,367 2,545 
Accumulated depreciation (2,047)(2,187)
Land, buildings and equipment, net $320 $358 
Depreciation expense was $68, $76 and $87 for the three years ended December 31, 2022, 2021 and 2020, respectively.
We lease buildings and equipment, substantially all of which are accounted for as operating leases. Finance leased assets were $18 and $9 at December 31, 2022 and 2021, respectively. Refer to Note 11 - Lessee for additional information regarding leased assets.
Internal Use Software
As of December 31, 2022 and 2021, capitalized costs related to internal use software, net of accumulated amortization, were $95 and $120, respectively. Useful lives of our internal use software generally vary from three to seven years.
Amortization expense was $45, $41 and $42 for the three years ended December 31, 2022, 2021 and 2020, respectively.