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Revenues - Disaggregation of Revenue (Details) - Operating Segments - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 9,315 $ 27,093
Supply and Logistics    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 8,534 24,832
Supply and Logistics | Crude oil transactions    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 7,978 22,651
Supply and Logistics | NGL and other transactions    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 556 2,181
Transportation    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 496 1,416
Transportation | Total tariff activities    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 460 1,313
Transportation | Crude oil pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 435 1,237
Transportation | NGL pipelines    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 25 76
Transportation | Trucking    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 36 103
Facilities    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 285 845
Facilities | Crude oil, NGL and other terminalling and storage    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 174 511
Facilities | NGL and natural gas processing and fractionation    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 87 278
Facilities | Rail load / unload    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 24 $ 56