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Regulatory Matters - Reliability Matters and FERC (Details)
$ in Millions
 1 Months Ended 6 Months Ended
Sep. 14, 2015
Aug. 24, 2012
USD ($)
Oct. 31, 2006
proceeding
Jun. 30, 2016
USD ($)
entities
subsidiary
Regulatory Matters [Line Items]        
Regional enforcement entities | entities       8
FERC        
Regulatory Matters [Line Items]        
Denied recovery charges of exit fees       $ 78.8
FERC | California Claims Matters        
Regulatory Matters [Line Items]        
Settlement proposal claims       $ 190.0
Court proceedings from filed claims | proceeding     1  
FERC | PATH-Allegheny | PATH Transmission Project        
Regulatory Matters [Line Items]        
Cost recovery, PP&E reclassified to Regulatory Assets   $ 62.0    
FERC | Path-WV | PATH Transmission Project        
Regulatory Matters [Line Items]        
Cost recovery, PP&E reclassified to Regulatory Assets   $ 59.0    
FERC | PATH | PATH Transmission Project        
Regulatory Matters [Line Items]        
Proposed return on equity   10.90%    
Requested return on equity (percent)   10.40%    
Return on equity granted for regional transmission organization participation   0.50%    
Remaining recovery period of regulatory assets 5 years      
FERC | FET        
Regulatory Matters [Line Items]        
Number of stand-alone transmission subsidiaries | subsidiary       2