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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2017
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
 
2017
 
2016
 
Lives
 
(In millions)
 
 
Facilities and equipment
$
15,907

 
$
18,698

 
1-40 Years
Land and improvements
710

 
750

 
 
Nuclear fuel
236

 
226

 
5 Years
Office furnishings and equipment
434

 
412

 
2-10 Years
Construction in progress
1,086

 
619

 
 
Total property, plant, and equipment
18,373

 
20,705

 
 
Accumulated depreciation
(4,465
)
 
(5,336
)
 
 
Net property, plant, and equipment
$
13,908

 
$
15,369

 
 

The Company recorded long-lived asset impairments during the years ended December 31, 2017 and 2016, as further described in Note 10, Asset Impairments.