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Regulatory Matters - Pennsylvania and West Virginia (Details)
6 Months Ended 10 Months Ended 12 Months Ended
Dec. 22, 2015
USD ($)
Dec. 21, 2015
USD ($)
Nov. 03, 2015
proposal
Oct. 19, 2015
USD ($)
Sep. 10, 2015
USD ($)
Aug. 31, 2015
USD ($)
Aug. 14, 2015
USD ($)
Jun. 19, 2015
Apr. 09, 2015
USD ($)
Feb. 03, 2015
USD ($)
Jun. 30, 2015
USD ($)
Feb. 24, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
proposal
Nov. 05, 2015
USD ($)
Pennsylvania                              
Regulatory Matters [Line Items]                              
Number of requests for proposal | proposal     1,000,000                     1  
Project term     2 years                     2 years  
Requested rate increase (decrease)                 $ 292,800,000            
Approved additional operating expenses                 87,700,000            
Pennsylvania | 3 Month Period                              
Regulatory Matters [Line Items]                              
Energy contract term                           3 months  
Pennsylvania | 12 Month Period                              
Regulatory Matters [Line Items]                              
Energy contract term     12 months                     12 months  
Pennsylvania | 24 Month Period                              
Regulatory Matters [Line Items]                              
Energy contract term     24 months                     24 months  
Pennsylvania | Unfavorable Regulatory Action                              
Regulatory Matters [Line Items]                              
Statutory penalty, maximum                           $ 234,000,000  
Pennsylvania | ME                              
Regulatory Matters [Line Items]                              
Requested rate increase (decrease)                 89,300,000            
Pennsylvania | Penn                              
Regulatory Matters [Line Items]                              
Requested rate increase (decrease)                 15,900,000            
Pennsylvania | WP                              
Regulatory Matters [Line Items]                              
Requested rate increase (decrease)                 96,800,000            
Pennsylvania | PN                              
Regulatory Matters [Line Items]                              
Requested rate increase (decrease)                 $ 90,800,000            
Pennsylvania | Pennsylvania Companies | Unfavorable Regulatory Action                              
Regulatory Matters [Line Items]                              
Statutory penalty, maximum                             $ 230,000,000
Minimum range of possible loss                             $ 200,000,000
Pennsylvania | PPUC | ME                              
Regulatory Matters [Line Items]                              
Proposed ROE               1.80%              
Energy consumption reduction targets (percent)               4.00%              
Requested rate increase (decrease)       $ 43,440,000                      
Pennsylvania | PPUC | Penn                              
Regulatory Matters [Line Items]                              
Proposed ROE               1.70%              
Energy consumption reduction targets (percent)               3.30%              
Requested rate increase (decrease)       $ 56,350,000                      
Pennsylvania | PPUC | WP                              
Regulatory Matters [Line Items]                              
Proposed ROE               1.80%              
Energy consumption reduction targets (percent)               2.60%              
LTIP recovery period       5 years                      
Requested rate increase (decrease)       $ 88,340,000                      
Pennsylvania | PPUC | PN                              
Regulatory Matters [Line Items]                              
Proposed ROE               0.00%              
Energy consumption reduction targets (percent)               3.90%              
Requested rate increase (decrease)       $ 56,740,000                      
West Virginia | MP and PE                              
Regulatory Matters [Line Items]                              
Requested rate increase (decrease)             $ 165,100,000                
Requested rate increase (decrease) (percent)             12.50%                
Under-recovered balance                     $ 97,000,000        
Under-recovered balance for 2016                           23,700,000  
West Virginia | WVPSC | MP and PE                              
Regulatory Matters [Line Items]                              
Requested rate increase (decrease)                   $ 15,000,000          
Cost recovery period                   5 years          
Deferred storm and property reserve deficiency                   $ 46,000,000          
West Virginia | WVPSC | MP and PE | ENEC                              
Regulatory Matters [Line Items]                              
Requested rate increase (decrease)         $ 144,500,000                    
Settlement amount $ 96,900,000                            
Amendment to requested rate increase (decrease)         $ (20,600,000)                    
West Virginia | WVPSC | MP and PE | Vegetation Management Program Surcharge                              
Regulatory Matters [Line Items]                              
Requested rate increase (decrease)           $ 37,700,000         $ 2,100,000 $ 49,900,000      
Settlement amount   $ 36,700,000                          
Requested rate increase (decrease) (percent)           2.80%                  
Approved rate recovery period   2 years                          
West Virginia | WVPSC | MP and PE | Vegetation Management Program Surcharge | Scenario, Forecast                              
Regulatory Matters [Line Items]                              
Requested rate increase (decrease)                         $ 23,900,000    
West Virginia | WVPSC | MP and PE | Harrison Power Station | ENEC                              
Regulatory Matters [Line Items]                              
Requested rate increase (decrease)                           $ 44,400,000