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Revenues and Accounts Receivable - Segment Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Total revenues $ 5,833 $ 7,886 $ 17,327 $ 24,515
Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues 146 196 484 581
Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues 150 149 473 457
Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues 5,537 7,541 16,370 23,477
Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 6,324 8,258 18,725 25,624
Total revenues 6,302 8,430 18,761 26,072
Operating Segments | Transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 488 590 1,514 1,685
Total revenues 494 597 1,530 1,712
Operating Segments | Facilities        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 262 281 831 843
Total revenues 271 291 860 880
Operating Segments | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 5,574 7,387 16,380 23,096
Total revenues 5,537 7,542 16,371 23,480
Intersegment        
Disaggregation of Revenue [Line Items]        
Total revenues (469) (544) (1,434) (1,557)
Intersegment | Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues (252) (278) (756) (774)
Intersegment | Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues (121) (142) (387) (423)
Intersegment | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues   (1) (1) (3)
Other | Operating Segments        
Disaggregation of Revenue [Line Items]        
Total revenues (22) 172 36 448
Other | Operating Segments | Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues 6 7 16 27
Other | Operating Segments | Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues 9 10 29 37
Other | Operating Segments | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues $ (37) $ 155 $ (9) $ 384