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Asset Impairments (Details 1)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 19, 2016
MW
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impairment of assets (Note 2)   $ 0   $ 8 $ 1,447 $ 24
Impairment     $ 800   800  
Loss on termination of contract   32        
Contract Termination            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Restructuring charges     58      
Competitive Energy Services            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impairment of assets     647      
Impairment         $ 800  
Competitive Energy Services | Income Approach Valuation Technique | Goodwill            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Discount rate (percent)         9.50%  
Terminal value of EBITDA         7.0  
FES            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impairment of assets (Note 2)   $ 0   $ 0 $ 540 $ 16
Impairment     23      
FES | Competitive Energy Services            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impairment of assets     $ 517      
Bay Shore Unit 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Plant capacity (in MW's) | MW 136          
Sammis Power Plant Units 1-4            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Plant capacity (in MW's) | MW 720