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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Level 3 |  |  |
Rollforward of Level 3 Net Asset/(Liability) |  |  |
Beginning Balance | $ 11 | $ 15 |
Losses for the period included in earnings | (1) |  |
Settlements | (9) | (12) |
Derivatives entered into during the period | (60) | 2 |
Ending Balance | (59) | 5 |
Change in unrealized gains/(losses) included in earnings relating to Level 3 derivatives still held at the end of the period | (1) | $ 2 |
Recurring Fair Value Measures |  |  |
Recurring Fair Value Measurements |  |  |
Net derivative asset/(liability) | (113) |  | $ 170
Recurring Fair Value Measures | Commodity Derivatives |  |  |
Recurring Fair Value Measurements |  |  |
Net derivative asset/(liability) | 80 |  | 227
Recurring Fair Value Measures | Interest Rate Derivatives |  |  |
Recurring Fair Value Measurements |  |  |
Net derivative asset/(liability) | (138) |  | (49)
Recurring Fair Value Measures | Foreign Currency Derivatives |  |  |
Recurring Fair Value Measurements |  |  |
Net derivative asset/(liability) | 5 |  | (8)
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option |  |  |
Recurring Fair Value Measurements |  |  |
Net derivative asset/(liability) | (60) |  |
Recurring Fair Value Measures | Level 1 |  |  |
Recurring Fair Value Measurements |  |  |
Net derivative asset/(liability) | 62 |  | 126
Recurring Fair Value Measures | Level 1 | Commodity Derivatives |  |  |
Recurring Fair Value Measurements |  |  |
Net derivative asset/(liability) | 62 |  | 126
Recurring Fair Value Measures | Level 2 |  |  |
Recurring Fair Value Measurements |  |  |
Net derivative asset/(liability) | (116) |  | 33
Recurring Fair Value Measures | Level 2 | Commodity Derivatives |  |  |
Recurring Fair Value Measurements |  |  |
Net derivative asset/(liability) | 17 |  | 90
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives |  |  |
Recurring Fair Value Measurements |  |  |
Net derivative asset/(liability) | (138) |  | (49)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives |  |  |
Recurring Fair Value Measurements |  |  |
Net derivative asset/(liability) | 5 |  | (8)
Recurring Fair Value Measures | Level 3 |  |  |
Recurring Fair Value Measurements |  |  |
Net derivative asset/(liability) | (59) |  | 11
Recurring Fair Value Measures | Level 3 | Commodity Derivatives |  |  |
Recurring Fair Value Measurements |  |  |
Net derivative asset/(liability) | 1 |  | $ 11
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option |  |  |
Recurring Fair Value Measurements |  |  |
Net derivative asset/(liability) | $ (60) |  |

X
- Definition Amount of derivatives entered into classified as a derivative asset (liability) after deduction of derivative asset (liability), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References No definition available. + Details
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