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Revenues and Accounts Receivable - Segment Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Total revenues $ 8,253 $ 8,080 $ 16,628 $ 16,478
Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues 188 152 385 298
Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues 151 147 307 288
Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues 7,914 7,781 15,936 15,892
Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 8,698 8,872 17,368 17,778
Total revenues 8,765 8,540 17,642 17,398
Operating Segments | Transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 551 470 1,095 920
Total revenues 559 475 1,115 929
Operating Segments | Facilities        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 283 278 563 560
Total revenues 291 284 589 576
Operating Segments | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 7,864 8,124 15,710 16,298
Total revenues 7,915 7,781 15,938 15,893
Intersegment        
Disaggregation of Revenue [Line Items]        
Total revenues (512) (460) (1,014) (920)
Intersegment | Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues (243) (211) (497) (412)
Intersegment | Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues (140) (137) (282) (288)
Intersegment | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues (1)   (2) (1)
Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total revenues 67 (332) 274 (380)
Other | Operating Segments | Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues 8 5 20 9
Other | Operating Segments | Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues 8 6 26 16
Other | Operating Segments | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues $ 51 $ (343) $ 228 $ (405)