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Estimates (Schedule of Inventory) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]        
Inventory valuation adjustments $ 120 $ (267) $ 229 $ 445
Inventory, Net [Abstract]        
Natural gas and NGLs 415 699 415  
Crude oil 424 683 424  
Refined products 378 483 378  
Spare parts and other 248 238 248  
Total inventories $ 1,465 $ 2,103 $ 1,465