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Operating Segments - Segment Financial Data (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
segment
Sep. 30, 2018
USD ($)
Segment Reporting Information [Line Items]        
Operating segments number | segment     3  
Revenues:        
Revenues $ 7,886 $ 8,792 $ 24,515 $ 25,269
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Equity earnings in unconsolidated entities 102 110 274 281
Segment Adjusted EBITDA 727 636 2,371 1,733
Maintenance capital 85 78 204 186
Transportation        
Revenues:        
Revenues 196 161 581 458
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Equity earnings in unconsolidated entities 102 110 274 281
Segment Adjusted EBITDA 462 388 1,271 1,083
Maintenance capital 42 41 110 102
Facilities        
Revenues:        
Revenues 149 149 457 437
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Segment Adjusted EBITDA 173 173 529 530
Maintenance capital 28 33 74 74
Supply and Logistics        
Revenues:        
Revenues 7,541 8,482 23,477 24,374
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments        
Segment Adjusted EBITDA 92 75 571 120
Maintenance capital 15 4 20 10
Operating Segments, Before Intersegment Adjustment | Transportation        
Revenues:        
Revenues 319 292 938 808
Operating Segments, Before Intersegment Adjustment | Facilities        
Revenues:        
Revenues 149 149 457 437
Operating Segments, Before Intersegment Adjustment | Supply and Logistics        
Revenues:        
Revenues 7,541 8,482 23,477 24,374
Intersegment        
Revenues:        
Revenues (544) (478) (1,557) (1,400)
Intersegment | Transportation        
Revenues:        
Revenues (278) (206) (774) (619)
Intersegment | Facilities        
Revenues:        
Revenues (142) (140) (423) (429)
Intersegment | Supply and Logistics        
Revenues:        
Revenues (1) (1) (3) (2)
Intersegment Adjustment        
Revenues:        
Revenues (123) (131) (357) (350)
Operating Segments        
Revenues:        
Revenues 8,430 9,270 26,072 26,669
Operating Segments | Transportation        
Revenues:        
Revenues 597 498 1,712 1,427
Operating Segments | Facilities        
Revenues:        
Revenues 291 289 880 866
Operating Segments | Supply and Logistics        
Revenues:        
Revenues $ 7,542 $ 8,483 $ 23,480 $ 24,376