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Investments, Loans and Long-Term Receivables (Narrative) (Details)
$ in Millions
Jun. 30, 2016
USD ($)
joint_venture
May 31, 2016
USD ($)
Aug. 31, 2009
Aug. 28, 2009
Aug. 27, 2009
Dakota Access LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Percentage of ownership interest 25.00%        
Loan agreement, maximum borrowing capacity   $ 2,256      
Contribution obligation by co-venturer $ 95        
Equity Method Investments $ 391        
Energy Transfer Crude Oil Company, LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Percentage of ownership interest 25.00%        
Loan agreement, maximum borrowing capacity   $ 227      
Contribution obligation by co-venturer $ 12        
Equity Method Investments $ 129        
Merey Sweeny [Member]          
Schedule of Equity Method Investments [Line Items]          
Additional ownership interest acquired     50.00% 50.00%  
Petroleos De Venezuela S.A. (PDVSA) [Member] | Merey Sweeny [Member]          
Schedule of Equity Method Investments [Line Items]          
Percentage of equity interest of others         50.00%
Energy Transfer [Member]          
Schedule of Equity Method Investments [Line Items]          
Number of joint ventures | joint_venture 2        
Conocophillips [Member] | Merey Sweeny [Member]          
Schedule of Equity Method Investments [Line Items]          
Percentage of ownership interest         50.00%
Corporate Joint Venture [Member] | Dakota Access LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Loans and leases receivable, related parties $ 382        
Corporate Joint Venture [Member] | Energy Transfer Crude Oil Company, LLC [Member]          
Schedule of Equity Method Investments [Line Items]          
Loans and leases receivable, related parties $ 46