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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
The components of our property, plant and equipment balance are as follows:
  
Estimated
Useful
Lives in Years		December 31,
Dollars in millions20212020
Land
N/A
$5 $5 
Buildings and property improvements
1-35
131 129 
Equipment and other
1-25
431 415 
Total567 549 
Less accumulated depreciation(431)(419)
Net property, plant and equipment$136 $130 
Property, plant and equipment includes approximately $39 million and $36 million of equipment and other assets under finance lease obligations as of December 31, 2021, and 2020, respectively. Depreciation expense, including amortization expense for finance ROU assets, was $42 million, $36 million and $33 million for the years ended December 31, 2021, 2020 and 2019, respectively.