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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 8,698 $ 8,872 $ 17,368 $ 17,778
Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 7,864 8,124 15,710 16,298
Supply and Logistics | Crude oil transactions        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 7,595 7,649 14,532 14,672
Supply and Logistics | NGL and other transactions        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 269 475 1,178 1,626
Transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 551 470 1,095 920
Transportation | Total tariff activities        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 516 436 1,021 852
Transportation | Crude oil pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 494 412 971 801
Transportation | NGL pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 22 24 50 51
Transportation | Trucking        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 35 34 74 68
Facilities        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 283 278 563 560
Facilities | Crude oil, NGL and other terminalling and storage        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 177 171 349 337
Facilities | NGL and natural gas processing and fractionation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 87 91 175 191
Facilities | Rail load / unload        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 19 $ 16 $ 39 $ 32