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Derivative Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Fair value of derivatives instruments |  |
Derivative Assets | $ 40 | $ 218
Derivative Liabilities | (106) | (238)
Current Assets - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Assets | 35 | 140
Deferred Charges and Other Assets - Other |  |
Fair value of derivatives instruments |  |
Derivative Assets | 5 | 78
Current Liabilities - Other |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (13) | (78)
Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (93) | (160)
Commodity contracts | Current Assets - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Assets | 30 | 133
Commodity contracts | Deferred Charges and Other Assets - Other |  |
Fair value of derivatives instruments |  |
Derivative Assets | 5 | 77
Commodity contracts | Current Liabilities - Other |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (11) | (72)
Commodity contracts | Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (1) | (52)
FTRs | Current Assets - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Assets | 5 | 7
FTRs | Current Liabilities - Other |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (2) | (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 | (92) | (108)
FES |  |
Fair value of derivatives instruments |  |
Derivative Assets | 36 | 214
Derivative Liabilities | (13) | (129)
FES | Current Assets - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Assets | 31 | 137
FES | Deferred Charges and Other Assets - Other |  |
Fair value of derivatives instruments |  |
Derivative Assets | 5 | 77
FES | Current Liabilities - Other |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (12) | (77)
FES | Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (1) | (52)
FES | Commodity contracts | Current Assets - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Assets | 30 | 133
FES | Commodity contracts | Deferred Charges and Other Assets - Other |  |
Fair value of derivatives instruments |  |
Derivative Assets | 5 | 77
FES | Commodity contracts | Current Liabilities - Other |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (11) | (72)
FES | Commodity contracts | Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (1) | (52)
FES | FTRs | Current Assets - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Assets | 1 | 4
FES | FTRs | Current Liabilities - Other |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | $ (1) | $ (5)

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