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Derivative Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair value of derivatives instruments |  |
Derivative Assets | $ 60 | $ 218
Derivative Liabilities | (133) | (238)
Current Assets - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Assets | 43 | 140
Deferred Charges and Other Assets - Other |  |
Fair value of derivatives instruments |  |
Derivative Assets | 17 | 78
Current Liabilities - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (27) | (78)
Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (106) | (160)
Commodity contracts | Current Assets - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Assets | 43 | 133
Commodity contracts | Deferred Charges and Other Assets - Other |  |
Fair value of derivatives instruments |  |
Derivative Assets | 17 | 77
Commodity contracts | Current Liabilities - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (23) | (72)
Commodity contracts | Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (3) | (52)
FTRs | Current Assets - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Assets | 0 | 7
FTRs | Current Liabilities - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (4) | (6)
NUGs | Deferred Charges and Other Assets - Other |  |
Fair value of derivatives instruments |  |
Derivative Assets | 0 | 1
NUGs | Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (103) | (108)
FES |  |
Fair value of derivatives instruments |  |
Derivative Assets | 60 | 214
Derivative Liabilities | (28) | (129)
FES | Current Assets - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Assets | 43 | 137
FES | Deferred Charges and Other Assets - Other |  |
Fair value of derivatives instruments |  |
Derivative Assets | 17 | 77
FES | Current Liabilities - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (25) | (77)
FES | Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (3) | (52)
FES | Commodity contracts | Current Assets - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Assets | 43 | 133
FES | Commodity contracts | Deferred Charges and Other Assets - Other |  |
Fair value of derivatives instruments |  |
Derivative Assets | 17 | 77
FES | Commodity contracts | Current Liabilities - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (23) | (72)
FES | Commodity contracts | Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (3) | (52)
FES | FTRs | Current Assets - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Assets | 0 | 4
FES | FTRs | Current Liabilities - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | $ (2) | $ (5)

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