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Revenues and Accounts Receivable - Segment Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Total revenues $ 9,154 $ 7,886 $ 8,253 $ 8,375 $ 8,786 $ 8,792 $ 8,080 $ 8,398 $ 33,669 $ 34,055 $ 26,223
Transportation                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 788 648 612
Facilities                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 609 588 555
Supply And Logistics                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 32,272 32,819 25,056
Operating Segments                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 35,371 35,812  
Total revenues                 35,767 35,973 27,956
Operating Segments | Transportation                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 2,283 1,976  
Total revenues                 2,320 1,990 1,718
Operating Segments | Facilities                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 1,122 1,136  
Total revenues                 1,171 1,161 1,173
Operating Segments | Supply And Logistics                      
Disaggregation of Revenue [Line Items]                      
Revenues from contracts with customers                 31,966 32,700  
Total revenues                 32,276 32,822 25,065
Intersegment                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 (2,098) (1,918) (1,733)
Intersegment | Transportation                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 (1,061) (874) (697)
Intersegment | Facilities                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 (562) (573) (618)
Intersegment | Supply And Logistics                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 (4) (3) $ (9)
Other | Operating Segments                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 396 161  
Other | Operating Segments | Transportation                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 37 14  
Other | Operating Segments | Facilities                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 49 25  
Other | Operating Segments | Supply And Logistics                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 $ 310 $ 122