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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Summary of 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
$$
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