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Derivatives and Risk Management Activities (Details 7) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Level 3 |  |  |  |  |
Rollforward of Level 3 Net Asset/(Liability) |  |  |  |  |
Beginning Balance | $ 9 | $ 1 | $ 15 | $ (3) |
Gains for the period included in earnings | 2 | 1 | 1 |  |
Settlements | (2) |  | (13) | 3 |
Derivatives entered into during the period | 2 | 1 | 8 | 3 |
Ending Balance | 11 | 3 | 11 | 3 |
Change in unrealized gains included in earnings relating to Level 3 derivatives still held at the end of the period | 4 | $ 2 | 9 | $ 3 |
Recurring Fair Value Measures |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net derivative asset/(liability) | 117 |  | 117 |  | $ 109
Recurring Fair Value Measures | Commodity Derivatives |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net derivative asset/(liability) | 183 |  | 183 |  | 191
Recurring Fair Value Measures | Interest Rate Derivatives |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net derivative asset/(liability) | (57) |  | (57) |  | (70)
Recurring Fair Value Measures | Foreign Currency Derivatives |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net derivative asset/(liability) | (9) |  | (9) |  | (12)
Recurring Fair Value Measures | Level 1 |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net derivative asset/(liability) | 90 |  | 90 |  | (85)
Recurring Fair Value Measures | Level 1 | Commodity Derivatives |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net derivative asset/(liability) | 90 |  | 90 |  | (85)
Recurring Fair Value Measures | Level 2 |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net derivative asset/(liability) | 16 |  | 16 |  | 179
Recurring Fair Value Measures | Level 2 | Commodity Derivatives |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net derivative asset/(liability) | 82 |  | 82 |  | 261
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net derivative asset/(liability) | (57) |  | (57) |  | (70)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net derivative asset/(liability) | (9) |  | (9) |  | (12)
Recurring Fair Value Measures | Level 3 |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net derivative asset/(liability) | 11 |  | 11 |  | 15
Recurring Fair Value Measures | Level 3 | Commodity Derivatives |  |  |  |  |
Recurring Fair Value Measures |  |  |  |  |
Net derivative asset/(liability) | $ 11 |  | $ 11 |  | $ 15

X
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