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Inventories Table - Inventory Balances (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Inventory, Net [Abstract] |  |
Other Inventory, Supplies, Gross | $ 417 | $ 338
Natural gas, NGLs, and refined products | 793 | 833
Energy Related Inventory, Crude Oil, Products and Merchandise | 622 | 506
Inventory, Net | $ 1,832 | $ 1,677

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