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Revenues and Accounts Receivable - Disaggregation of Revenue (Details) - Operating Segments - 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]        
Revenues from contracts with customers $ 10,645 $ 3,772 $ 19,740 $ 12,401
Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 9,904 3,055 18,300 10,806
Supply and Logistics | Crude oil transactions        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 9,619 2,928 17,331 10,251
Supply and Logistics | NGL and other transactions        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 285 127 969 555
Transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 509 453 954 1,026
Transportation | Total tariff activities        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 489 431 912 969
Transportation | Crude oil pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 462 405 859 917
Transportation | NGL pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 27 26 53 52
Transportation | Trucking        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 20 22 42 57
Facilities        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 232 264 486 569
Facilities | Crude oil, NGL and other terminalling and storage        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 154 176 324 357
Facilities | NGL and natural gas processing and fractionation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 70 80 142 190
Facilities | Rail load / unload        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 8 $ 8 $ 20 $ 22