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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment    
Total property, plant, and equipment $ 4,345 $ 4,859
Accumulated depreciation (1,752) (1,811)
Net property, plant, and equipment 2,593 3,048
Facilities and equipment    
Property, Plant and Equipment    
Total property, plant, and equipment $ 3,262 3,763
Facilities and equipment | Minimum    
Property, Plant and Equipment    
Depreciable lives (in years) 1 year  
Facilities and equipment | Maximum    
Property, Plant and Equipment    
Depreciable lives (in years) 40 years  
Land and improvements    
Property, Plant and Equipment    
Total property, plant, and equipment $ 324 347
Nuclear fuel    
Property, Plant and Equipment    
Total property, plant, and equipment $ 235 212
Depreciable lives (in years) 5 years  
Hardware and office equipment and furnishings    
Property, Plant and Equipment    
Total property, plant, and equipment $ 422 431
Hardware and office equipment and furnishings | Minimum    
Property, Plant and Equipment    
Depreciable lives (in years) 2 years  
Hardware and office equipment and furnishings | Maximum    
Property, Plant and Equipment    
Depreciable lives (in years) 10 years  
Construction in progress    
Property, Plant and Equipment    
Total property, plant, and equipment $ 102 $ 106