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Derivative Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
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Fair value of derivatives instruments |  |
Derivative Assets | $ 244 | $ 237
Derivative Liabilities | (272) | (281)
Current Assets |  |
Fair value of derivatives instruments |  |
Derivative Assets | 161 | 157
Noncurrent Assets |  |
Fair value of derivatives instruments |  |
Derivative Assets | 83 | 80
Current Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (102) | (106)
Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (170) | (175)
Commodity contracts | Current Assets |  |
Fair value of derivatives instruments |  |
Derivative Assets | 144 | 150
Commodity contracts | Noncurrent Assets |  |
Fair value of derivatives instruments |  |
Derivative Assets | 82 | 78
Commodity contracts | Current Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (94) | (94)
Commodity contracts | Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (46) | (37)
FTRs | Current Assets |  |
Fair value of derivatives instruments |  |
Derivative Assets | 17 | 7
FTRs | Noncurrent Assets |  |
Fair value of derivatives instruments |  |
Derivative Assets | 0 | 1
FTRs | Current Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | (8) | (12)
FTRs | Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | 0 | (1)
NUGs | Noncurrent Assets |  |
Fair value of derivatives instruments |  |
Derivative Assets | 1 | 1
NUGs | Noncurrent Liabilities |  |
Fair value of derivatives instruments |  |
Derivative Liabilities | $ (124) | $ (137)

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