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Revenues - Disaggregation of Revenue (Details) - Operating Segments - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 8,872 $ 17,778
Supply and Logistics    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 8,124 16,298
Supply and Logistics | Crude oil transactions    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 7,649 14,672
Supply and Logistics | NGL and other transactions    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 475 1,626
Transportation    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 470 920
Transportation | Total tariff activities    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 436 852
Transportation | Crude oil pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 412 801
Transportation | NGL pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 24 51
Transportation | Trucking    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 34 68
Facilities    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 278 560
Facilities | Crude oil, NGL and other terminalling and storage    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 171 337
Facilities | NGL and natural gas processing and fractionation    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 91 191
Facilities | Rail load / unload    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 16 $ 32