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Operating Segments - Segment Financial Data (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
segment
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting Information [Line Items]      
Operating segments number | segment 3    
Revenues:      
Revenues $ 8,269 $ 8,375  
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments      
Equity earnings in unconsolidated entities 110 89  
Segment Adjusted EBITDA 793 861  
Maintenance capital 51 46  
Total assets 23,700   $ 28,677
Transportation      
Revenues:      
Revenues 187 197  
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments      
Equity earnings in unconsolidated entities 108 89  
Segment Adjusted EBITDA 442 399  
Maintenance capital 34 27  
Total assets 13,669   14,902
Facilities      
Revenues:      
Revenues 175 156  
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments      
Equity earnings in unconsolidated entities 2    
Segment Adjusted EBITDA 210 184  
Maintenance capital 14 17  
Total assets 6,094   7,336
Supply and Logistics      
Revenues:      
Revenues 7,907 8,022  
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments      
Segment Adjusted EBITDA 141 278  
Maintenance capital 3 2  
Total assets 3,937   $ 6,439
Operating Segments Excluding Intersegment Elimination | Transportation      
Revenues:      
Revenues 297 303  
Operating Segments Excluding Intersegment Elimination | Facilities      
Revenues:      
Revenues 175 156  
Operating Segments Excluding Intersegment Elimination | Supply and Logistics      
Revenues:      
Revenues 7,907 8,022  
Intersegment      
Revenues:      
Revenues (531) (502)  
Intersegment | Transportation      
Revenues:      
Revenues (282) (253)  
Intersegment | Facilities      
Revenues:      
Revenues (138) (143)  
Intersegment | Supply and Logistics      
Revenues:      
Revenues (1)    
Intersegment Adjustment      
Revenues:      
Revenues (110) (106)  
Operating Segments      
Revenues:      
Revenues 8,800 8,877  
Operating Segments | Transportation      
Revenues:      
Revenues 579 556  
Operating Segments | Facilities      
Revenues:      
Revenues 313 299  
Operating Segments | Supply and Logistics      
Revenues:      
Revenues $ 7,908 $ 8,022