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PROPERTY, PLANT AND EQUIPMENT
12 Months Ended
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,
20202019
Land, land improvements, and mineral rights$1,213 $582 
Buildings703 158 
Equipment6,786 1,456 
Other151 101 
Construction in progress1,364 730 
Total property, plant and equipment1
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,
20202019
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.