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Asset Impairments (Details 1)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 20, 2017
Aug. 30, 2017
Aug. 30, 2017
MW
Aug. 30, 2017
Natural_gas_plant
Aug. 30, 2017
transmission_center
Aug. 30, 2017
USD ($)
Aug. 30, 2017
Aug. 30, 2017
limited_guaranty
Jul. 22, 2016
MW
Jan. 31, 2017
USD ($)
MW
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                
Impairment of assets                         $ 647      
Impairment of assets (Note 14)                           $ 162 $ 1,447  
Impairment                         800     $ 800
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                           158    
Competitive Energy Services | Income Approach Valuation Technique                                
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                         $ 517      
Impairment of assets (Note 14)                           0 $ 540  
Impairment                         $ 23      
Loss on contract termination                       $ 32        
MAIT                                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                
Impairment of assets (Note 14)                     $ 13          
Purchase Agreement with Aspen Generating, LLC                                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                
Plant capacity (in MW's) | MW     1,615             1,572            
Cash purchase price           $ 825       $ 925            
Number of limited guaranties         2     2                
Term of guaranties   3 years                            
Purchase Agreement with Aspen Generating, LLC | AE Supply                                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                
Number of gas generating plants | Natural_gas_plant       4                        
Discharge of note indenture           305                    
Make-whole premiums           $ 100                    
Purchase Agreement with Aspen Generating, LLC | AGC                                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                
Ownership percentage             59.00%                  
Purchase Agreement with Aspen Generating, LLC | AGC | Subsequent Event                                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                
Ownership percentage 59.00%                              
Purchase Agreement with Aspen Generating, LLC | BU Energy                                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                
Ownership percentage             50.00%                  
Purchase Agreement with Aspen Generating, LLC | Buchanan Power Station [Member]                                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                
Plant capacity (in MW's) | MW     43                          
Disposal Group | Bay Shore Unit 1                                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                
Plant capacity (in MW's) | MW                 136              
Disposal Group | 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              
Held-for-sale                                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                
Assets held-for-sale                     765     765    
Investments                     20     20    
Inventory                     4     4    
Asset retirement obligations                     $ 1     $ 1