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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 |  |  |  |  |

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