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Inventories Table - Inventory Balances (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
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