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PROPERTY, PLANT AND EQUIPMENT | 9 Months Ended
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Sep. 30, 2021
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:
| (In Millions)
| September 30, 2021 |  | December 31, 2020
Land, land improvements and mineral rights | $ | 1,285 |  |  | $ | 1,213 |
Buildings | 852 |  |  | 703 |
Equipment | 8,334 |  |  | 6,786 |
Other | 213 |  |  | 151 |
Construction in progress | 417 |  |  | 1,364 |
Total property, plant and equipment 1 | 11,101 |  |  | 10,217 |
Allowance for depreciation and depletion | (2,127) |  |  | (1,474) |
Property, plant and equipment, net | $ | 8,974 |  |  | $ | 8,743 |
1 Includes right-of-use assets related to finance leases of $396 million and $361 million as of September 30, 2021 and December 31, 2020, respectively.
We recorded depreciation and depletion expense of $238 million and $661 million for the three and nine months ended September 30, 2021, respectively, and $72 million and $183 million for the three and nine months ended September 30, 2020, 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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