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Operating Segments - Segment Financial Data (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Operating segments number | segment	3
Revenues:
Revenues	$ 8,375	$ 8,398
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Equity earnings in unconsolidated entities	89	75
Segment Adjusted EBITDA	861	592
Maintenance capital	46	45
Transportation
Revenues:
Revenues	197	146
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Equity earnings in unconsolidated entities	89	75
Segment Adjusted EBITDA	399	335
Maintenance capital	27	29
Facilities
Revenues:
Revenues	156	141
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Segment Adjusted EBITDA	184	185
Maintenance capital	17	14
Supply and Logistics
Revenues:
Revenues	8,022	8,111
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Segment Adjusted EBITDA	278	72
Maintenance capital	2	2
Operating Segments, Before Intersegment Adjustment | Transportation
Revenues:
Revenues	303	253
Operating Segments, Before Intersegment Adjustment | Facilities
Revenues:
Revenues	156	141
Operating Segments, Before Intersegment Adjustment | Supply and Logistics
Revenues:
Revenues	8,022	8,111
Intersegment
Revenues:
Revenues	(502)	(460)
Intersegment | Transportation
Revenues:
Revenues	(253)	(201)
Intersegment | Facilities
Revenues:
Revenues	(143)	(151)
Intersegment | Supply and Logistics
Revenues:
Revenues		(1)
Intersegment Adjustment
Revenues:
Revenues	(106)	(107)
Operating Segments
Revenues:
Revenues	8,877	8,858
Operating Segments | Transportation
Revenues:
Revenues	556	454
Operating Segments | Facilities
Revenues:
Revenues	299	292
Operating Segments | Supply and Logistics
Revenues:
Revenues	$ 8,022	$ 8,112

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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