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Other Property and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Other Property and Equipment Other Property and Equipment
Other Property and Equipment
A summary of other property and equipment held for use and the estimated useful lives thereof is as follows:
December 31,
Estimated
Useful
Life
20202019
($ in millions)(in years)
Buildings and improvements$1,038 $1,058 
10 – 39
Computer equipment356 355 
5
Sand mine81 78 
10 – 30
Natural gas compressors(a)
36 48 
3 – 20
Land113 115  
Other130 156 
5 – 20
Total other property and equipment, at cost
1,754 1,810 
Less: accumulated depreciation
(799)(692)
Total other property and equipment, net
$955 $1,118 
___________________________________________
(a)    Includes assets under finance lease of $27 million, less accumulated depreciation of $18 million and $10 million, as of December 31, 2020 and 2019, respectively. The related amortization expense for assets under finance lease is included in depreciation, depletion and amortization expense on our consolidated statement of operations.