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Revenues - Disaggregation of Revenue (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Supply and Logistics  
Disaggregation of Revenue [Line Items]  
Revenues from contracts with customers $ 8,174
Supply and Logistics | Crude oil transactions  
Disaggregation of Revenue [Line Items]  
Revenues from contracts with customers 7,023
Supply and Logistics | NGL and other transactions  
Disaggregation of Revenue [Line Items]  
Revenues from contracts with customers 1,151
Transportation  
Disaggregation of Revenue [Line Items]  
Revenues from contracts with customers 450
Transportation | Total tariff activities  
Disaggregation of Revenue [Line Items]  
Revenues from contracts with customers 416
Transportation | Crude oil pipelines  
Disaggregation of Revenue [Line Items]  
Revenues from contracts with customers 389
Transportation | NGL pipelines  
Disaggregation of Revenue [Line Items]  
Revenues from contracts with customers 27
Transportation | Trucking  
Disaggregation of Revenue [Line Items]  
Revenues from contracts with customers 34
Facilities  
Disaggregation of Revenue [Line Items]  
Revenues from contracts with customers 282
Facilities | Crude oil, NGL and other terminalling and storage  
Disaggregation of Revenue [Line Items]  
Revenues from contracts with customers 166
Facilities | NGL and natural gas processing and fractionation  
Disaggregation of Revenue [Line Items]  
Revenues from contracts with customers 100
Facilities | Rail load / unload  
Disaggregation of Revenue [Line Items]  
Revenues from contracts with customers $ 16