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Derivative Instruments (Details 2)
MWh in Millions, MMBTU in Millions
Mar. 31, 2017
MWh
MMBTU
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) 13
Sales (in MWH or mmBTUs) 0
Net (in MWH or mmBTUs) 13
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 1
Sales (in MWH or mmBTUs) | MMBTU 1
Net (in MWH or mmBTUs) | MMBTU 0
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) 11
Sales (in MWH or mmBTUs) 0
Net (in MWH or mmBTUs) 11
FES | Natural Gas  
Volume of First Energy's outstanding derivative transactions  
Purchases (in MWH or mmBTUs) | MMBTU 1
Sales (in MWH or mmBTUs) | MMBTU 1
Net (in MWH or mmBTUs) | MMBTU 0