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PROPERTY, PLANT AND EQUIPMENT
12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT
NOTE 6 - PROPERTY, PLANT AND EQUIPMENT
The following table indicates the carrying value of each of the major classes of our depreciable assets:
December 31,
(In millions)20222021
Land, land improvements and mineral rights$1,388 $1,291 
Buildings921 889 
Equipment9,289 8,709 
Other238 229 
Construction in progress552 408 
Total property, plant and equipment1
12,388 11,526 
Allowance for depreciation and depletion(3,318)(2,340)
Property, plant and equipment, net$9,070 $9,186 
1 Includes right-of-use assets related to finance leases of $408 million and $411 million as of December 31, 2022 and 2021, respectively.
We recorded depreciation expense of $988 million, $848 million and $298 million for the years ended December 31, 2022, 2021 and 2020, respectively. Depreciation expense for the year ended December 31, 2022 includes $23 million of accelerated depreciation related to the decision to indefinitely idle the coke facility at Middletown Works and $68 million of accelerated depreciation related to the indefinite idle of the Indiana Harbor #4 blast furnace.
During the year ended December 31, 2022, we announced the permanent closure of Mountain State Carbon, which resulted in a $29 million asset impairment charge.
The net book value of the mineral and land rights are as follows:
December 31,
(In millions)20222021
Mineral rights:
Cost$780 $780 
Depletion(225)(187)
Net mineral rights$555 $593 
Land rights$434 $406 
We recorded depletion expense of $38 million, $46 million and $8 million for the years ended December 31, 2022, 2021, and 2020, respectively.