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Derivative Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair value of derivatives instruments |  |
Derivative Assets | $ 250 | $ 237
Derivative Liabilities | (259) | (281)
Current Assets - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Assets | 152 | 157
Deferred Charges and Other Assets - Other |  |
Fair value of derivatives instruments |  |
Derivative Assets | 98 | 80
Current Liabilities - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (91) | (106)
Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (168) | (175)
Commodity contracts | Current Assets - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Assets | 139 | 150
Commodity contracts | Deferred Charges and Other Assets - Other |  |
Fair value of derivatives instruments |  |
Derivative Assets | 98 | 78
Commodity contracts | Current Liabilities - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (84) | (94)
Commodity contracts | Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (50) | (37)
FTRs | Current Assets - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Assets | 13 | 7
FTRs | Deferred Charges and Other Assets - Other |  |
Fair value of derivatives instruments |  |
Derivative Assets | 0 | 1
FTRs | Current Liabilities - Derivatives |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (7) | (12)
FTRs | Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | 0 | (1)
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 | $ (118) | $ (137)

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