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Derivatives and Risk Management Activities - Assets and Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | $ 436 |  | $ 436 |  | $ 480
Liability Derivatives Fair Value | (187) |  | (187) |  | (262)
Net loss expected to be reclassified to earnings in the next twelve months |  |  | 8 |  |
Other current assets |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 393 |  | 393 |  | 443
Liability Derivatives Fair Value | (97) |  | (97) |  | (182)
Other long-term assets, net |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 37 |  | 37 |  | 34
Liability Derivatives Fair Value | (4) |  | (4) |  | (7)
Other current liabilities |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Liability Derivatives Fair Value | (51) |  | (51) |  | (20)
Other long-term liabilities and deferred credits |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 6 |  | 6 |  | 3
Liability Derivatives Fair Value | (35) |  | (35) |  | (53)
Interest Rate Derivatives |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Net unrealized gain/(loss) recognized in AOCI | (35) | $ 13 | (58) | $ 45 |
Derivatives in Hedging Relationships | Interest Rate Derivatives |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value |  |  |  |  | 2
Liability Derivatives Fair Value | (43) |  | (43) |  | (9)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current assets |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value |  |  |  |  | 2
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current liabilities |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Liability Derivatives Fair Value | (43) |  | (43) |  | (1)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Liability Derivatives Fair Value |  |  |  |  | (8)
Derivatives Not Designated as a Hedge |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 436 |  | 436 |  | 478
Liability Derivatives Fair Value | (144) |  | (144) |  | (253)
Derivatives Not Designated as a Hedge | Other current assets |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 393 |  | 393 |  | 441
Liability Derivatives Fair Value | (97) |  | (97) |  | (182)
Derivatives Not Designated as a Hedge | Other long-term assets, net |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 37 |  | 37 |  | 34
Liability Derivatives Fair Value | (4) |  | (4) |  | (7)
Derivatives Not Designated as a Hedge | Other current liabilities |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Liability Derivatives Fair Value | (8) |  | (8) |  | (19)
Derivatives Not Designated as a Hedge | Other long-term liabilities and deferred credits |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 6 |  | 6 |  | 3
Liability Derivatives Fair Value | (35) |  | (35) |  | (45)
Derivatives Not Designated as a Hedge | Commodity Derivatives |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 432 |  | 432 |  | 478
Liability Derivatives Fair Value | (123) |  | (123) |  | (208)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 389 |  | 389 |  | 441
Liability Derivatives Fair Value | (96) |  | (96) |  | (182)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term assets, net |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 37 |  | 37 |  | 34
Liability Derivatives Fair Value | (4) |  | (4) |  | (7)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current liabilities |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Liability Derivatives Fair Value | (8) |  | (8) |  | (10)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term liabilities and deferred credits |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 6 |  | 6 |  | 3
Liability Derivatives Fair Value | (15) |  | (15) |  | (9)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 4 |  | 4 |  |
Liability Derivatives Fair Value | (1) |  | (1) |  | (9)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current assets |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 4 |  | 4 |  |
Liability Derivatives Fair Value | (1) |  | (1) |  |
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current liabilities |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Liability Derivatives Fair Value |  |  |  |  | (9)
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Liability Derivatives Fair Value | (20) |  | (20) |  | (36)
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 | (20) |  | (20) |  | $ (36)
AOCI cash flow hedge |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Net loss deferred in AOCI | $ 230 |  | $ 230 |  |

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