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Derivative Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair value of derivatives |  |
Derivative Assets | $ 218 | $ 237
Derivative Liabilities | (238) | (281)
Current Assets |  |
Fair value of derivatives |  |
Derivative Assets | 140 | 157
Deferred Charges and Other Assets |  |
Fair value of derivatives |  |
Derivative Assets | 78 | 80
Current Liabilities |  |
Fair value of derivatives |  |
Derivative Liabilities | (78) | (106)
Noncurrent Liabilities |  |
Fair value of derivatives |  |
Derivative Liabilities | (160) | (175)
Commodity contracts | Current Assets |  |
Fair value of derivatives |  |
Derivative Assets | 133 | 150
Commodity contracts | Deferred Charges and Other Assets |  |
Fair value of derivatives |  |
Derivative Assets | 77 | 78
Commodity contracts | Current Liabilities |  |
Fair value of derivatives |  |
Derivative Liabilities | (72) | (94)
Commodity contracts | Noncurrent Liabilities |  |
Fair value of derivatives |  |
Derivative Liabilities | (52) | (37)
FTRs | Current Assets |  |
Fair value of derivatives |  |
Derivative Assets | 7 | 7
FTRs | Deferred Charges and Other Assets |  |
Fair value of derivatives |  |
Derivative Assets | 0 | 1
FTRs | Current Liabilities |  |
Fair value of derivatives |  |
Derivative Liabilities | (6) | (12)
FTRs | Noncurrent Liabilities |  |
Fair value of derivatives |  |
Derivative Liabilities | 0 | (1)
NUGs | Deferred Charges and Other Assets |  |
Fair value of derivatives |  |
Derivative Assets | 1 | 1
NUGs | Noncurrent Liabilities |  |
Fair value of derivatives |  |
Derivative Liabilities | (108) | (137)
FES |  |
Fair value of derivatives |  |
Derivative Assets | 214 | 233
Derivative Liabilities | (129) | (142)
FES | Current Assets |  |
Fair value of derivatives |  |
Derivative Assets | 137 | 154
FES | Deferred Charges and Other Assets |  |
Fair value of derivatives |  |
Derivative Assets | 77 | 79
FES | Current Liabilities |  |
Fair value of derivatives |  |
Derivative Liabilities | (77) | (104)
FES | Noncurrent Liabilities |  |
Fair value of derivatives |  |
Derivative Liabilities | (52) | (38)
FES | Commodity contracts | Current Assets |  |
Fair value of derivatives |  |
Derivative Assets | 133 | 150
FES | Commodity contracts | Deferred Charges and Other Assets |  |
Fair value of derivatives |  |
Derivative Assets | 77 | 78
FES | Commodity contracts | Current Liabilities |  |
Fair value of derivatives |  |
Derivative Liabilities | (72) | (94)
FES | Commodity contracts | Noncurrent Liabilities |  |
Fair value of derivatives |  |
Derivative Liabilities | (52) | (37)
FES | FTRs | Current Assets |  |
Fair value of derivatives |  |
Derivative Assets | 4 | 4
FES | FTRs | Deferred Charges and Other Assets |  |
Fair value of derivatives |  |
Derivative Assets | 0 | 1
FES | FTRs | Current Liabilities |  |
Fair value of derivatives |  |
Derivative Liabilities | (5) | (10)
FES | FTRs | Noncurrent Liabilities |  |
Fair value of derivatives |  |
Derivative Liabilities | $ 0 | $ (1)

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