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Operating Segments - Segment Financial Data (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
Segment Reporting Information [Line Items]        
Operating segments number | segment     3  
Revenues:        
Revenues $ 8,253 $ 8,080 $ 16,628 $ 16,478
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Equity earnings in unconsolidated entities 83 96 172 171
Segment Adjusted EBITDA 782 505 1,643 1,097
Maintenance capital 72 63 118 108
Transportation        
Revenues:        
Revenues 188 152 385 298
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Equity earnings in unconsolidated entities 83 96 172 171
Segment Adjusted EBITDA 410 360 809 695
Maintenance capital 39 32 67 61
Facilities        
Revenues:        
Revenues 151 147 307 288
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Segment Adjusted EBITDA 172 171 356 357
Maintenance capital 30 26 46 41
Supply and Logistics        
Revenues:        
Revenues 7,914 7,781 15,936 15,892
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Segment Adjusted EBITDA 200 (26) 478 45
Maintenance capital 3 5 5 6
Operating Segments, Before Intersegment Adjustment | Transportation        
Revenues:        
Revenues 316 264 618 517
Operating Segments, Before Intersegment Adjustment | Facilities        
Revenues:        
Revenues 151 147 307 288
Operating Segments, Before Intersegment Adjustment | Supply and Logistics        
Revenues:        
Revenues 7,914 7,781 15,936 15,892
Intersegment        
Revenues:        
Revenues (512) (460) (1,014) (920)
Intersegment | Transportation        
Revenues:        
Revenues (243) (211) (497) (412)
Intersegment | Facilities        
Revenues:        
Revenues (140) (137) (282) (288)
Intersegment | Supply and Logistics        
Revenues:        
Revenues (1)   (2) (1)
Intersegment Adjustment        
Revenues:        
Revenues (128) (112) (233) (219)
Operating Segments        
Revenues:        
Revenues 8,765 8,540 17,642 17,398
Operating Segments | Transportation        
Revenues:        
Revenues 559 475 1,115 929
Operating Segments | Facilities        
Revenues:        
Revenues 291 284 589 576
Operating Segments | Supply and Logistics        
Revenues:        
Revenues $ 7,915 $ 7,781 $ 15,938 $ 15,893