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Inventories Table - Inventory Balances (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Inventory, Net [Abstract] |  |
Natural gas, NGLs, and refined products | $ 812 | $ 1,120
Crude oil | 701 | 551
Spare parts and other | 348 | 351
Total inventories | $ 1,861 | $ 2,022

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