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Derivative Instruments (Details 2)
MWh in Millions
Sep. 30, 2017
MWh
Power Contracts  
Volume of First Energy's outstanding derivative transactions  
Purchases (in MWH or mmBTUs) 1
Sales (in MWH or mmBTUs) 8
Net (in MWH or mmBTUs) (7)
FTRs  
Volume of First Energy's outstanding derivative transactions  
Purchases (in MWH or mmBTUs) 14
Sales (in MWH or mmBTUs) 0
Net (in MWH or mmBTUs) 14
NUGs  
Volume of First Energy's outstanding derivative transactions  
Purchases (in MWH or mmBTUs) 2
Sales (in MWH or mmBTUs) 0
Net (in MWH or mmBTUs) 2
FES | Power Contracts  
Volume of First Energy's outstanding derivative transactions  
Purchases (in MWH or mmBTUs) 1
Sales (in MWH or mmBTUs) 8
Net (in MWH or mmBTUs) (7)
FES | FTRs  
Volume of First Energy's outstanding derivative transactions  
Purchases (in MWH or mmBTUs) 7
Sales (in MWH or mmBTUs) 0
Net (in MWH or mmBTUs) 7