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Derivative Instruments (Details 2)
MWh in Millions
Jun. 30, 2017
MWh
Power Contracts  
Volume of First Energy's outstanding derivative transactions  
Purchases (in MWH or mmBTUs) 2
Sales (in MWH or mmBTUs) 11
Net (in MWH or mmBTUs) (9)
FTRs  
Volume of First Energy's outstanding derivative transactions  
Purchases (in MWH or mmBTUs) 19
Sales (in MWH or mmBTUs) 0
Net (in MWH or mmBTUs) 19
NUGs  
Volume of First Energy's outstanding derivative transactions  
Purchases (in MWH or mmBTUs) 3
Sales (in MWH or mmBTUs) 0
Net (in MWH or mmBTUs) 3
FES | Power Contracts  
Volume of First Energy's outstanding derivative transactions  
Purchases (in MWH or mmBTUs) 2
Sales (in MWH or mmBTUs) 11
Net (in MWH or mmBTUs) (9)
FES | FTRs  
Volume of First Energy's outstanding derivative transactions  
Purchases (in MWH or mmBTUs) 10
Sales (in MWH or mmBTUs) 0
Net (in MWH or mmBTUs) 10