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Estimates (Schedule of Inventory) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventory, Net [Abstract]      
Natural gas, NGLs, and refined products $ 1,120 $ 1,141  
Crude oil 551 651  
Spare parts and other 351 263  
Total inventories $ 2,022 $ 2,055 [1] $ 1,453
[1] * As adjusted. See Note 2.