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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2019
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)20192018Lives
Facilities and equipment$3,262  $3,763  
1-40 years
Land and improvements324  347  
Nuclear fuel235  212  
5 years
Hardware and office equipment and furnishings422  431  
2-10 years
Construction in progress102  106   
Total property, plant, and equipment4,345  4,859   
Accumulated depreciation(1,752) (1,811)  
Net property, plant, and equipment $2,593  $3,048