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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
NRG's Major Classes of 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