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Derivatives and Risk Management Activities - Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | $ 480 | $ 90
Liability derivatives fair value | (262) | (425)
Initial margin | 95 | 48
Variation margin posted/(returned) | (91) | 164
Letters of credit | (184) | (166)
Net broker payable | (80) |
Net broker receivable |  | 212
Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 443 | 79
Liability derivatives fair value | (182) | (229)
Other long-term assets, net |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 34 | 1
Liability derivatives fair value | (7) | 0
Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value |  | 7
Liability derivatives fair value | (20) | (158)
Other long-term liabilities and deferred credits |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 3 | 3
Liability derivatives fair value | (53) | (38)
Derivatives in Hedging Relationships | Interest Rate Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 2 | 2
Liability derivatives fair value | (9) | (38)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 2 | 0
Liability derivatives fair value | 0 | 0
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term assets, net |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 0 | 0
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value |  | 2
Liability derivatives fair value | (1) | (27)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 0 | 0
Liability derivatives fair value | (8) | (11)
Derivatives Not Designated as a Hedge |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 478 | 88
Liability derivatives fair value | (253) | (387)
Derivatives Not Designated as a Hedge | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 441 | 79
Liability derivatives fair value | (182) | (229)
Derivatives Not Designated as a Hedge | Other long-term assets, net |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 34 | 1
Liability derivatives fair value | (7) | 0
Derivatives Not Designated as a Hedge | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value |  | 5
Liability derivatives fair value | (19) | (131)
Derivatives Not Designated as a Hedge | Other long-term liabilities and deferred credits |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 3 | 3
Liability derivatives fair value | (45) | (27)
Derivatives Not Designated as a Hedge | Commodity Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 478 | 82
Liability derivatives fair value | (208) | (363)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 441 | 73
Liability derivatives fair value | (182) | (227)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term assets, net |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 34 | 1
Liability derivatives fair value | (7) | 0
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value |  | 5
Liability derivatives fair value | (10) | (131)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term liabilities and deferred credits |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 3 | 3
Liability derivatives fair value | (9) | (5)
Derivatives Not Designated as a Hedge | Interest Rate Derivatives | Other long-term assets, net |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives fair value | 0 | 0
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 0 | 6
Liability derivatives fair value | (9) | (2)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 0 | 6
Liability derivatives fair value | 0 | (2)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other long-term assets, net |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 0 | 0
Liability derivatives fair value | 0 | 0
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value |  | 0
Liability derivatives fair value | (9) | 0
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other long-term liabilities and deferred credits |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 0 | 0
Liability derivatives fair value | 0 | 0
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 0 | 0
Liability derivatives fair value | (36) | (22)
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 0 | 0
Liability derivatives fair value | 0 | 0
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other long-term assets, net |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 0 | 0
Liability derivatives fair value | 0 | 0
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value |  | 0
Liability derivatives fair value | 0 | 0
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other long-term liabilities and deferred credits |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives fair value | 0 | 0
Liability derivatives fair value | (36) | (22)
Exchange Traded |  |
Derivatives, Fair Value [Line Items] |  |
Letters of credit | $ (84) | $ 0

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