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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2018
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
 
2018
 
2017
 
Lives
 
(In millions)
 
 
Facilities and equipment
$
3,763

 
$
6,904

 
1-40 Years
Land and improvements
347

 
468

 
 
Nuclear fuel
212

 
235

 
5 Years
Office furnishings and equipment
431

 
421

 
2-10 Years
Construction in progress
106

 
201

 
 
Total property, plant, and equipment
4,859

 
8,229

 
 
Accumulated depreciation
(1,811
)
 
(2,255
)
 
 
Net property, plant, and equipment
$
3,048

 
$
5,974

 
 

The Company recorded long-lived asset impairments during the years ended December 31, 2018 and 2017, as further described in Note 9, Asset Impairments.