PROPERTY, PLANT AND EQUIPMENT

12 Months Ended

Dec. 31, 2022

Property, Plant and Equipment [Abstract]

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)	2022		2021
Land, land improvements and mineral rights	$	1,388	$	1,291
Buildings	921		889
Equipment	9,289		8,709
Other	238		229
Construction in progress	552		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)	2022		2021
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.