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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | The following table indicates the carrying value of each of the major classes of our depreciable assets:
| (In Millions)
| December 31,
| 2020 |  | 2019
Land, land improvements, and mineral rights | $ | 1,213 |  |  | $ | 582 |
Buildings | 703 |  |  | 158 |
Equipment | 6,786 |  |  | 1,456 |
Other | 151 |  |  | 101 |
Construction in progress | 1,364 |  |  | 730 |
Total property, plant and equipment 1 | 10,217 |  |  | 3,027 |
Allowance for depreciation and depletion | (1,474) |  |  | (1,098) |
Property, plant, and equipment, net | $ | 8,743 |  |  | $ | 1,929 |
1 Includes right-of-use assets related to finance leases of $361 million and $49 million as of December 31, 2020 and 2019, respectively.
We recorded depreciation expense of $298 million, $77 million and $66 million for the years ended December 31, 2020, 2019 and 2018, respectively. We recorded capitalized interest into property, plant and equipment of $53 million, $25 million and $7 million during the years ended December 31, 2020, 2019 and 2018, respectively. The net book value of the mineral and land rights are as follows:
| (In Millions)
| December 31,
| 2020 |  | 2019
Mineral rights: |  |  |
Cost | $ | 773 |  |  | $ | 537 |
Depletion | (142) |  |  | (134) |
Net mineral rights | $ | 631 |  |  | $ | 403 |
Land rights | $ | 361 |  |  | $ | 12 |
We recorded depletion expense of $8 million, $8 million and $7 million for the years ended December 31, 2020, 2019, and 2018, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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