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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2023
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) | 2023 |  | 2022
Land, land improvements and mineral rights | $ | 1,389 |  |  | $ | 1,388 |
Buildings | 946 |  |  | 921 |
Equipment | 9,680 |  |  | 9,289 |
Other | 302 |  |  | 238 |
Construction in progress | 590 |  |  | 552 |
Total property, plant and equipment 1 | 12,907 |  |  | 12,388 |
Allowance for depreciation and depletion | (4,012) |  |  | (3,318) |
Property, plant and equipment, net | $ | 8,895 |  |  | $ | 9,070 |
1 Includes right-of-use assets related to finance leases of $306 million and $408 million as of December 31, 2023 and 2022, respectively.
We recorded depreciation expense of $932 million, $988 million and $848 million for the years ended December 31, 2023, 2022 and 2021, 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) | 2023 |  | 2022
Mineral rights: |  |  |
Cost | $ | 783 |  |  | $ | 780 |
Depletion | (258) |  |  | (225) |
Net mineral rights | $ | 525 |  |  | $ | 555 |
Land rights | $ | 427 |  |  | $ | 434 |
We recorded depletion expense of $33 million, $38 million and $46 million for the years ended December 31, 2023, 2022, and 2021, respectively.

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