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Revenues and Accounts Receivable - Disaggregation of Revenue (Details) - Operating Segments - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 8,258 $ 9,315 $ 25,624 $ 27,093
Supply and Logistics        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 7,387 8,534 23,096 24,832
Supply and Logistics | Crude oil transactions        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 7,185 7,978 21,716 22,651
Supply and Logistics | NGL and other transactions        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 202 556 1,380 2,181
Transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 590 496 1,685 1,416
Transportation | Total tariff activities        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 557 460 1,579 1,313
Transportation | Crude oil pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 532 435 1,504 1,237
Transportation | NGL pipelines        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 25 25 75 76
Transportation | Trucking        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 33 36 106 103
Facilities        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 281 285 843 845
Facilities | Crude oil, NGL and other terminalling and storage        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 174 174 523 511
Facilities | NGL and natural gas processing and fractionation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 87 87 262 278
Facilities | Rail load / unload        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 20 $ 24 $ 58 $ 56