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Land, Buildings, Equipment and Software, Net
 12 Months Ended
Dec. 31, 2023
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)20232022
Land$8 $8 
Building and building equipment
25 to 50
678 708 
Leasehold improvements
1 to 12
78 112 
Plant machinery
5 to 12
855 1,000 
Office furniture and equipment
3 to 15
436 460 
Finance leased assets
1 to 12
33 26 
Other
4 to 20
37 38 
Construction in progress11 15 
Subtotal 2,136 2,367 
Accumulated depreciation(1)
 (1,870)(2,047)
Land, buildings and equipment, net $266 $320 
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(1)Depreciation expense was $60, $68 and $76 for the three years ended December 31, 2023, 2022 and 2021, respectively.
We lease buildings and equipment, substantially all of which are accounted for as operating leases. Refer to Note 11 - Lessee for additional information regarding leased assets.
Internal Use Software
As of December 31, 2023 and 2022, capitalized costs related to internal use software, net of accumulated amortization, were $68 and $95, respectively. Useful lives of our internal use software generally vary from three to seven years.