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PROPERTY, PLANT AND EQUIPMENT
 9 Months Ended
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 
Buildings852 703 
Equipment8,334 6,786 
Other213 151 
Construction in progress417 1,364 
Total property, plant and equipment1
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.