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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
The Company's major classes of property, plant, and equipment were as follows:
 As of December 31,Depreciable
(In millions)20202019Lives
Facilities and equipment$3,365 $3,262 
1-40 years
Land and improvements329 324 
Nuclear fuel239 235 
5 years
Hardware and office equipment and furnishings453 422 
2-10 years
Construction in progress97 102  
Total property, plant, and equipment4,483 4,345  
Accumulated depreciation(1,936)(1,752) 
Net property, plant, and equipment $2,547 $2,593  
The Company recorded long-lived asset impairments during the years ended December 31, 2020 and 2019, as further described in Note 11, Asset Impairments. Depreciation expense of property, plant and equipment recorded during the years ended 2020, 2019 and 2018 was $295 million, $271 million and $356 million, respectively.