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Estimates (Schedule of Inventory) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Inventory, Net [Abstract] |  |
Natural gas, NGLs and refined products (1) | $ 833 | $ 1,120
Crude oil | 506 | 551
Spare parts and other | 338 | 351
Total inventories | $ 1,677 | $ 2,022

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