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Estimates (Schedule of Inventory) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accounting Policies [Abstract] |  |  |  |
Inventory valuation adjustments | $ 120 | $ (267) | $ 229 | $ 445
Inventory, Net [Abstract] |  |  |  |
Natural gas and NGLs | 415 | 699 | 415 |
Crude oil | 424 | 683 | 424 |
Refined products | 378 | 483 | 378 |
Spare parts and other | 248 | 238 | 248 |
Total inventories | $ 1,465 | $ 2,103 | $ 1,465 |

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