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Acquisitions and Divestitures Business Combinations and Acquisitions of Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Feb. 01, 2016
Dec. 31, 2015
Feb. 27, 2015
Feb. 13, 2015
Business Acquisition [Line Items]            
Goodwill $ 22,162 $ 22,152   $ 23,790    
BP Terminal Assets [Member]            
Business Acquisition [Line Items]            
Purchase price     $ 349      
Current assets     2      
Property, plant, and equipment     396      
Deferred charges & other     0      
Goodwill     0      
Debt     0      
Other liabilities     $ (49)      
Vopak Terminal Assets [Member]            
Business Acquisition [Line Items]            
Purchase price         $ 158  
Current assets         2  
Property, plant, and equipment         155  
Deferred charges & other         0  
Goodwill         6  
Debt         0  
Other liabilities         $ (5)  
Hiland Partners, LP [Member]            
Business Acquisition [Line Items]            
Purchase price           $ 1,709
Current assets           79
Property, plant, and equipment           1,492
Deferred charges & other           1,498
Goodwill           310
Debt           (1,413)
Other liabilities           $ (257)