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Acquisitions (Recognized Identified Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2016
Mar. 31, 2016
Apr. 01, 2015
Aug. 31, 2014
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Business Acquisition [Line Items]              
Goodwill         $ 2,612   $ 2,618
E T P Dropdown [Member]              
Business Acquisition [Line Items]              
Payments to Acquire Businesses, Gross   $ 2,200          
Emerge Energy Services LP [Member]              
Business Acquisition [Line Items]              
Business acquisition total purchase price $ 171            
Current assets 26            
Property and equipment 49            
Goodwill 55            
Intangible assets 57            
Current liabilities (16)            
Cash acquired $ 0            
Sunoco LLC [Member]              
Business Acquisition [Line Items]              
Business acquisition total purchase price     $ 775        
Current assets       $ 1,107      
Property and equipment       384      
Goodwill       0      
Intangible assets       182      
Current liabilities       (641)      
Net assets       1,027      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets       2      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other       (7)      
Sunoco LLC and Sunoco Retail LLC [Member]              
Business Acquisition [Line Items]              
Business acquisition total purchase price     $ 775        
Payments to Acquire Businesses, Gross         $ 0 $ 2,200  
Sunoco Retail LLC [Member]              
Business Acquisition [Line Items]              
Current assets       329      
Property and equipment       710      
Goodwill       1,289      
Intangible assets       294      
Current liabilities       (146)      
Net assets       2,136      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets       0      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other       (340)      
Sunoco LLC and Sunoco Retail [Member]              
Business Acquisition [Line Items]              
Current assets       1,436      
Property and equipment       1,094      
Goodwill       1,289      
Intangible assets       476      
Current liabilities       (787)      
Net assets       3,163      
Cash acquired       (24)      
Total cash consideration, net of cash acquired       2,951      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets       2      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other       (347)      
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deemed Contribution       $ (188)