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Derivatives and Risk Management Activities - Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative assets and liabilities |  |  |
Asset derivatives fair value | $ 90 | $ 108 |
Liability derivatives fair value | (425) | (481) |
Initial margin | 48 | 119 |
Variation margin posted | 164 | 291 |
Net broker receivable | 212 | 410 |
Net loss deferred in AOCI | 223 |  |
Net loss expected to be reclassified to earnings in the next twelve months | 8 |  |
Remaining loss expected to be reclassified to earnings through 2049 | 215 |  |
Net deferred gain/(loss) recognized in AOCI on derivatives | (16) | (33) | $ 1
Commodity Derivatives |  |  |
Derivative assets and liabilities |  |  |
Net deferred gain/(loss) recognized in AOCI on derivatives |  |  | 33
Interest Rate Derivatives |  |  |
Derivative assets and liabilities |  |  |
Net deferred gain/(loss) recognized in AOCI on derivatives | (16) | (33) | $ (32)
Derivatives in Hedging Relationships |  |  |
Derivative assets and liabilities |  |  |
Asset derivatives fair value | 2 |  |
Liability derivatives fair value | (38) | (50) |
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current liabilities |  |  |
Derivative assets and liabilities |  |  |
Asset derivatives fair value | 2 |  |
Liability derivatives fair value | (27) | (23) |
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits |  |  |
Derivative assets and liabilities |  |  |
Liability derivatives fair value | (11) | (27) |
Derivatives Not Designated as a Hedge |  |  |
Derivative assets and liabilities |  |  |
Asset derivatives fair value | 88 | 108 |
Liability derivatives fair value | (387) | (431) |
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets |  |  |
Derivative assets and liabilities |  |  |
Asset derivatives fair value | 73 | 101 |
Liability derivatives fair value | (227) | (344) |
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term assets, net |  |  |
Derivative assets and liabilities |  |  |
Asset derivatives fair value | 1 | 2 |
Liability derivatives fair value |  | (1) |
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current liabilities |  |  |
Derivative assets and liabilities |  |  |
Asset derivatives fair value | 5 |  |
Liability derivatives fair value | (131) | (14) |
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term liabilities and deferred credits |  |  |
Derivative assets and liabilities |  |  |
Asset derivatives fair value | 3 | 2 |
Liability derivatives fair value | (5) | (34) |
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current assets |  |  |
Derivative assets and liabilities |  |  |
Asset derivatives fair value | 6 |  |
Liability derivatives fair value | (2) |  |
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current liabilities |  |  |
Derivative assets and liabilities |  |  |
Asset derivatives fair value |  | 3 |
Liability derivatives fair value |  | (6) |
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other long-term liabilities and deferred credits |  |  |
Derivative assets and liabilities |  |  |
Liability derivatives fair value | $ (22) | $ (32) |

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