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PROPERTY, PLANT AND EQUIPMENT | 6 Months Ended
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Jun. 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)
| June 30, 2021 |  | December 31, 2020
Land, land improvements and mineral rights | $ | 1,274 |  |  | $ | 1,213 |
Buildings | 865 |  |  | 703 |
Equipment | 8,104 |  |  | 6,786 |
Other | 205 |  |  | 151 |
Construction in progress | 430 |  |  | 1,364 |
Total property, plant and equipment 1 | 10,878 |  |  | 10,217 |
Allowance for depreciation and depletion | (1,896) |  |  | (1,474) |
Property, plant and equipment, net | $ | 8,982 |  |  | $ | 8,743 |
1 Includes right-of-use assets related to finance leases of $376 million and $361 million as of June 30, 2021 and December 31, 2020, respectively.
We recorded depreciation and depletion expense of $208 million and $423 million for the three and six months ended June 30, 2021, respectively, and $75 million and $111 million for the three and six months ended June 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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