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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2012
Jun. 30, 2016
Aug. 31, 2009
Aug. 28, 2009
Merey Sweeny [Member]        
Variable interest entities VIEs (Textual) [Abstract]        
Additional ownership interest acquired in MSLP that is in dispute     50.00% 50.00%
Maximum exposure under debt guarantee   $ 179    
Merey Sweeny [Member] | MSLP 8.85% Senior Notes [Member] | Guarantees of Joint Venture Debt [Member]        
Variable interest entities VIEs (Textual) [Abstract]        
Debt guarantee to lender of 8.85% senior notes issued by MSLP, percentage 100.00%      
Stated interest rate of debt issued, percentage 8.85%      
Maximum exposure under debt guarantee   $ 140    
Dakota Access LLC [Member]        
Variable interest entities VIEs (Textual) [Abstract]        
Percentage of ownership interest   25.00%    
Energy Transfer Crude Oil Company, LLC [Member]        
Variable interest entities VIEs (Textual) [Abstract]        
Percentage of ownership interest   25.00%    
DAPL And ETCOP [Member]        
Variable interest entities VIEs (Textual) [Abstract]        
Book value of investment   $ 520    
Loans and leases receivable, related parties   $ 107