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Inventories Table - Inventory Balances (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
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