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Revenues and Accounts Receivable - Segment Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Total revenues $ 8,375 $ 8,398
Transportation    
Disaggregation of Revenue [Line Items]    
Total revenues 197 146
Facilities    
Disaggregation of Revenue [Line Items]    
Total revenues 156 141
Supply and Logistics    
Disaggregation of Revenue [Line Items]    
Total revenues 8,022 8,111
Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 8,673 8,906
Total revenues 8,877 8,858
Operating Segments | Transportation    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 544 450
Total revenues 556 454
Operating Segments | Facilities    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 283 282
Total revenues 299 292
Operating Segments | Supply and Logistics    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 7,846 8,174
Total revenues 8,022 8,112
Intersegment    
Disaggregation of Revenue [Line Items]    
Total revenues (502) (460)
Intersegment | Transportation    
Disaggregation of Revenue [Line Items]    
Total revenues (253) (201)
Intersegment | Facilities    
Disaggregation of Revenue [Line Items]    
Total revenues (143) (151)
Intersegment | Supply and Logistics    
Disaggregation of Revenue [Line Items]    
Total revenues   (1)
Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Total revenues 204 (48)
Other | Operating Segments | Transportation    
Disaggregation of Revenue [Line Items]    
Total revenues 12 4
Other | Operating Segments | Facilities    
Disaggregation of Revenue [Line Items]    
Total revenues 16 10
Other | Operating Segments | Supply and Logistics    
Disaggregation of Revenue [Line Items]    
Total revenues $ 176 $ (62)