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Asset Impairments (Details 1)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 22, 2016
MW
Jul. 27, 2017
USD ($)
limited_guaranty
Natural_gas_plant
MW
Jun. 30, 2017
USD ($)
Jun. 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       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     $ 131    
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       $ 23  
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     792    
Investments     20    
Inventory     4    
Asset retirement obligations     $ 1    
Subsequent Event | 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   1,572      
Cash purchase price   $ 925      
Number of limited guaranties | limited_guaranty   2      
Subsequent Event | 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      
Subsequent Event | Purchase Agreement with Aspen Generating, LLC | AGC          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Ownership percentage   59.00%