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Derivative Instruments (Details 2)
MWh in Millions, MMBTU in Millions
Sep. 30, 2016
MWh
MMBTU
Power Contracts  
Volume of First Energy's outstanding derivative transactions  
Purchases (in MWH or mmBTUs) 9
Sales (in MWH or mmBTUs) 49
Net (in MWH or mmBTUs) (40)
FTRs  
Volume of First Energy's outstanding derivative transactions  
Purchases (in MWH or mmBTUs) 42
Sales (in MWH or mmBTUs) 0
Net (in MWH or mmBTUs) 42
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
Natural Gas  
Volume of First Energy's outstanding derivative transactions  
Purchases (in MWH or mmBTUs) | MMBTU 49
Sales (in MWH or mmBTUs) | MMBTU 0
Net (in MWH or mmBTUs) | MMBTU 49