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Revenues and Accounts Receivable - Segment Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Total revenues $ 9,930 $ 3,225 $ 18,313 $ 11,494
Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues 162 151 299 338
Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues 145 149 308 323
Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues 9,623 2,925 17,706 10,833
Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 10,645 3,772 19,740 12,401
Other items in revenues (225) (114) (479) 58
Total revenues 10,420 3,658 19,261 12,459
Operating Segments | Transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 509 453 954 1,026
Other items in revenues 44 4 85 10
Total revenues 553 457 1,039 1,036
Operating Segments | Facilities        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 232 264 486 569
Other items in revenues 12 12 29 20
Total revenues 244 276 515 589
Operating Segments | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 9,904 3,055 18,300 10,806
Other items in revenues (281) (130) (593) 28
Total revenues 9,623 2,925 17,707 10,834
Intersegment        
Disaggregation of Revenue [Line Items]        
Total revenues (490) (433) (948) (965)
Intersegment | Transportation        
Disaggregation of Revenue [Line Items]        
Total revenues (310) (223) (561) (504)
Intersegment | Facilities        
Disaggregation of Revenue [Line Items]        
Total revenues (99) (127) (207) (266)
Intersegment | Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Total revenues $ 0 $ 0 $ (1) $ (1)