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Revenues and Accounts Receivable - Segment Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                      
Total revenues $ 8,786 $ 8,792 $ 8,080 $ 8,398 $ 7,605 $ 5,873 $ 6,078 $ 6,667 $ 34,055 $ 26,223 $ 20,182
Transportation                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 1,116 1,021 954
Facilities                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 588 555 546
Supply and Logistics                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 32,819 25,056 19,004
Operating Segments                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 35,812    
Total revenues                 35,973 27,956 21,709
Operating Segments | Transportation                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 1,976    
Total revenues                 1,990 1,718 1,584
Operating Segments | Facilities                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 1,136    
Total revenues                 1,161 1,173 1,107
Operating Segments | Supply and Logistics                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 32,700    
Total revenues                 32,822 25,065 19,018
Intersegment                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 (1,918) (1,733) (1,527)
Intersegment | Transportation                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 (874) (697) (630)
Intersegment | Facilities                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 (573) (618) (561)
Intersegment | Supply and Logistics                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 (3) $ (9) $ (14)
Other | Operating Segments                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 161    
Other | Operating Segments | Transportation                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 14    
Other | Operating Segments | Facilities                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 25    
Other | Operating Segments | Supply and Logistics                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 $ 122